Take a woman we’ll call Priya. Three years managing hypertension with medication before her cardiologist, almost as an afterthought, mentioned alternate nostril breathing. Skeptical — she was a data analyst, not someone drawn to anything that sounded vaguely like it came from a wellness retreat. But her blood pressure stubbornly sat at 148/92 despite two medications, and her cardiologist told her the research was solid. Six weeks in, her blood pressure dropped to 132/84. Not a cure. Not a replacement for her medication. But a real, measurable, unexpected improvement from a five-minute daily practice that cost her nothing.
Alternate nostril breathing — nadi shodhana pranayama in Sanskrit — is one of the oldest codified breathing practices in the world, with documented yogic texts describing the technique dating back centuries. For most of that history, its claimed benefits rested on traditional and experiential authority. That changed when researchers started putting it in clinical trials and discovered several of its traditional claims have precise physiological mechanisms that hold up under scientific scrutiny.
This article covers what actually happens in the nervous system during nadi shodhana practice, what the research — particularly Shirley Telles and colleagues’ work published in 2013 — shows about blood pressure, heart rate, and autonomic balance, and how to practice it correctly. Also covered: the nasal cycle physiology that makes the left-nostril versus right-nostril distinction more than symbolic.
What Is Alternate Nostril Breathing
There are multiple variants in yogic tradition with different timing ratios, retentions (kumbhaka), and purposes. The version studied most extensively in clinical research, and the version appropriate for most beginners, is the simplest form: no breath retention, comfortable pace, equal inhale and exhale duration. The more advanced versions — particularly those with extended breath retentions — carry different physiological profiles and different risk considerations, appropriate for experienced practitioners working with qualified instruction, not beginners working from a written guide.
The name nadi shodhana translates approximately as “channel purification” — nadi referring to the subtle energy channels of yogic anatomy, shodhana meaning cleansing or purification. Within the traditional framework, the left and right nostrils are associated with the Ida and Pingala nadis, mapping onto the cooling/feminine/parasympathetic and heating/masculine/sympathetic energy channels respectively. The practice, within tradition, is understood as a balancing of these opposing energies.
The neuroscientific translation of this framework — while it collapses much of the subtlety of the traditional system — maps reasonably well onto observable physiology. Left nostril breathing has measurable effects on the right hemisphere and parasympathetic activation; right nostril breathing has measurable effects on the left hemisphere and sympathetic activation. Alternating stimulates both systems cyclically, which appears to produce the autonomic balance the tradition describes as “purification.”
The Nasal Cycle: Physiology You Were Never Taught
Most people believe they breathe equally through both nostrils simultaneously. They don’t. The body runs a rhythmic alternation of nasal dominance — the nasal cycle — where one nostril stays more patent (open) and does most of the breathing work while the other sits partially congested, cycling roughly every 90 to 200 minutes throughout the day. The cycle is driven by the erectile tissue of the nasal turbinates — the same mechanism as erectile tissue elsewhere in the body — controlled by the autonomic nervous system.
Not a pathological phenomenon. Normal human physiology that most people are completely unaware of, because the congestion is partial and doesn’t cause obvious obstruction. Verifiable directly: alternately close each nostril and exhale onto a mirror or a hand, and a clear airflow asymmetry shows up, changing over the course of a day.
The nasal cycle is controlled by the sympathetic nervous system via the sphenopalatine ganglion. Right nostril dominance associates with greater sympathetic activity, higher core body temperature, left hemisphere activity. Left nostril dominance associates with greater parasympathetic activity, lower body temperature, right hemisphere activity. Established through electroencephalography (EEG) studies showing nasal cycle phase predicts cognitive task performance in ways consistent with hemispheric lateralization — subjects perform spatial tasks better during right hemisphere (left nostril dominant) phases, verbal tasks better during left hemisphere (right nostril dominant) phases.
The nasal cycle also affects olfactory function. The olfactory epithelium performs better with lower airflow — slower air over the sensors allows more contact time with odorant molecules. The more-congested, lower-flow nostril is actually better at detecting low-concentration odorants, which is why smell differs slightly through each nostril and why olfactory detection researchers have to control for nasal cycle phase in their experiments.
Alternate nostril breathing deliberately overrides the natural nasal cycle by creating equal alternating airflow through both nostrils. Physiologically, this creates a forced bilateral stimulation that may produce the autonomic balancing effect observed in clinical studies. The mechanism isn’t completely understood — could be mechanical stimulation of olfactory or trigeminal nerve endings that differ in distribution between nostrils, the afferent neural pathways associated with nasal airflow sensing, or a more complex autonomic feedback mechanism. What’s clear from the research: the left-right asymmetry in breathing has measurable neurological correlates, and deliberate alternation appears to shift autonomic balance in measurable ways.
Telles 2013: What the Research Actually Found
The Telles study published in Medical Science Monitor in 2013 is among the most rigorously designed clinical investigations of nadi shodhana. Shirley Telles and colleagues at the Swami Vivekananda Yoga Research Foundation randomized healthy volunteers to alternate nostril breathing, right nostril breathing, left nostril breathing, or breath awareness (active control) conditions. Cardiovascular measures were taken before, during, and after the practice.
Key findings: alternate nostril breathing produced significant reductions in both systolic and diastolic blood pressure compared to baseline and to the control condition. Heart rate decreased. These effects showed up after just a single session of fifteen to twenty minutes. The authors’ autonomic interpretation: alternate nostril breathing activated both sympathetic and parasympathetic pathways in a balanced way that produced net cardiovascular calming despite the sympathetic stimulation component.
Particularly interesting: the condition-specific effects. Right nostril breathing alone (left nostril closed throughout) increased sympathetic markers — slightly elevated heart rate, slightly increased skin conductance. Left nostril breathing alone produced predominantly parasympathetic effects. Alternate nostril breathing combined both but resulted in a net calming effect, suggesting the balance itself — the rhythmic alternation — is key, not simply the addition of sympathetic and parasympathetic stimulation.
This research built on earlier Telles studies and the work of other researchers including Naveen (1997), who showed EEG changes with one-sided nostril breathing, and Raghuraj (2008), who found that thirty minutes of right-nostril unilateral breathing increased sympathetic activity and metabolic rate. The body of evidence from these studies isn’t massive by pharmaceutical trial standards, but it’s mechanistically coherent and directionally consistent — alternate nostril breathing produces measurable cardiovascular and autonomic effects in the expected direction.
Important caveat: most studies in this field use small samples, often lack blinding (inherent in breathing research), and come from research institutions affiliated with yoga organizations. Doesn’t invalidate the findings, but it warrants appropriate epistemic humility about effect sizes and generalizability. The direction of the effect is well-supported; the precise magnitude and duration of benefit need more research in larger, more diverse populations.
Sympathetic and Parasympathetic Balance: The Core Mechanism
Understanding why alternate nostril breathing affects the autonomic nervous system requires a basic map of how the ANS works — and why “balance” matters more than simply activating one branch or the other.
The autonomic nervous system has two main branches: sympathetic (fight-or-flight, stress activation) and parasympathetic (rest-and-digest, recovery activation). Not simple “on/off” switches — continuous, opposing forces whose relative tone at any moment determines everything from heart rate and blood pressure to digestive function, immune activity, and cognitive performance. Health requires both systems to function well and to transition smoothly between states.
The problem for most modern adults isn’t insufficient sympathetic activation — plenty of that comes from daily stressors. The problem is inadequate parasympathetic recovery. The parasympathetic system needs low-demand periods to restore its capacity to respond. Chronic stress keeps sympathetic tone elevated, the parasympathetic system never fully restores, and it responds less robustly when needed — during rest, during sleep, during recovery. That shows up as poor sleep, slow recovery from exercise, difficulty relaxing, the general sense of being perpetually wound up.
Alternate nostril breathing appears to restore this balance not by simply cranking up parasympathetic tone (as extended exhale breathwork does) but by cycling through both systems in a controlled, rhythmic way that exercises both branches. Functionally analogous to the benefit of exercise for cardiovascular fitness — the heart doesn’t become more efficient by staying at a steady elevated rate, but by cycling through a range that exercises both its capacity to accelerate and its capacity to recover. The same logic may apply to the autonomic nervous system’s flexibility (captured by HRV) and to the specific intervention of alternate nostril breathing.
The Nostril Balance Protocol Framework
The Nostril Balance Protocol is a structured approach to integrating alternate nostril breathing as a daily practice, building from basic technique to therapeutic application over four weeks. Designed for adults who want the cardiovascular and autonomic benefits documented in clinical research without the complexity of full pranayama systems.
- Position and hand placement. Sit comfortably upright — chair, floor, whatever allows an unsupported, relaxed upright posture for the session duration. Right hand for nostril control. Index finger and middle finger resting on the forehead or folded down — thumb closes the right nostril, ring finger (sometimes with the little finger) closes the left. This is Vishnu mudra. Left hand rests on left knee, palm up or down. Eyes closed.
- Basic cycle without retention (Weeks 1-2). Close right nostril with thumb. Inhale slowly through left nostril for four counts. Close left nostril with ring finger, release thumb. Exhale through right nostril for four counts. Inhale through right nostril for four counts. Close right nostril with thumb, release ring finger. Exhale through left nostril for four counts. One cycle. Five cycles once daily, building to ten cycles over the first two weeks.
- Extended session (Weeks 3-4). Increase to fifteen to twenty minutes daily. Optionally extend the exhalation to six counts while keeping inhalation at four — the 4-6 ratio extends the parasympathetic activation component without introducing retention. Don’t rush the pace. Comfortable and natural, not forced or strained. Dizzy or tense — shorten the count and reduce the session length.
- Therapeutic application. The left-nostril-dominant technique (close right nostril, breathe exclusively through left for three to five minutes) as an acute stress response tool — before difficult conversations, during high-anxiety situations, before sleep. The right-nostril-dominant technique (close left nostril, breathe exclusively through right for three to five minutes) for a mild energy boost before tasks requiring alertness. Reserve the full alternate technique for the daily maintenance session.
- Assessment. After four weeks, assess changes in resting heart rate, subjective sleep quality, and stress reactivity during daily life. With a blood pressure cuff, compare pre- and post-practice readings within sessions (practice, then measure immediately). The within-session cardiovascular effect observed in clinical research should be apparent by week two for most practitioners.
Who Benefits Most From Alternate Nostril Breathing
The research and clinical experience suggest particularly strong applications for specific populations and conditions.
People with cardiovascular risk factors. The blood pressure reduction documented in the Telles 2013 study and related research makes alternate nostril breathing a meaningful complementary intervention for hypertension, high resting heart rate, or elevated cardiovascular risk. Not a replacement for medication or lifestyle changes, but it adds a real physiological benefit that costs nothing and has no side effects. The effect is acute (within a single session) as well as cumulative with regular practice.
People with anxiety and chronic stress. The autonomic balancing mechanism makes this well-suited for anxiety. Unlike WHM breathing, which involves aggressive hyperventilation, nadi shodhana is gentle and doesn’t risk triggering panic in CO2-sensitive individuals. The slow, controlled rhythm with nasal resistance naturally produces a slow respiratory rate and extended tidal volume that activates the parasympathetic system. Clinical studies on yoga and anxiety consistently find nadi shodhana among the most effective breathwork components.
People with insomnia and poor sleep quality. The pre-sleep application of alternate nostril breathing — particularly the left-nostril-dominant variant — has a solid theoretical and growing empirical basis. Sleep onset requires parasympathetic dominance; the difficulty many people have initiating sleep is closely linked to insufficient autonomic downregulation. Ten minutes of nadi shodhana before sleep is a behavioral intervention addressing this mechanism directly. Several clinical studies specifically show improvements in sleep quality with pre-sleep pranayama practice.
Athletes during recovery periods. High-intensity training creates significant sympathetic load. Active recovery strategies promoting parasympathetic restoration are valuable for training adaptation. Athletes who use alternate nostril breathing in the hours following intense training report faster subjective recovery, and HRV data in studies of yoga-integrated training programs shows improved HRV recovery in athletes who include pranayama compared to those who don’t.
Contraindications and Limitations
Alternate nostril breathing is among the safest breathwork modalities and carries no significant contraindications for most people. The absence of forced hyperventilation and the gentle pace eliminate the primary dangers of more aggressive practices.
Nasal obstruction is the most common practical limitation. A deviated septum, chronic nasal polyps, or severe allergic rhinitis can make the mechanical technique of breathing through each nostril separately difficult or impossible. Partial occlusion (pressing the nostril partially rather than fully closed) may allow adequate airflow for the practice in these cases, or the obstruction may need medical attention before the technique becomes accessible.
Acute respiratory infections are a reason to pause the practice. Forced nasal breathing with congested, inflamed nasal passages can push infected mucus into the sinuses and Eustachian tubes, raising the risk of sinusitis or ear infections. Resume once the infection clears.
Severe cardiovascular conditions warrant physician consultation before beginning any breathwork practice, nadi shodhana included. While the cardiovascular effects of alternate nostril breathing generally run in a beneficial direction, the mechanism involves measurable autonomic changes that should be discussed with a cardiologist in cases of severe arrhythmia, recent cardiac events, or significant valve disease.
“The breath is the one physiological function you can control consciously and the one that runs automatically when you stop paying attention. Every breathwork practice is an attempt to use the first property to improve the second. Nadi shodhana does this more gently than almost anything else available.”
Integrating Alternate Nostril Breathing With Other Practices
Nadi shodhana doesn’t exist in isolation — it sits within a broader landscape of breathwork, stress management, and physical health practices. Understanding how it fits with other tools helps use it more strategically rather than adding it to a random stack of interventions.
Within a breathwork stack, alternate nostril breathing occupies the “balancing and maintenance” role. Not the acute stress-relief tool (box breathing or physiological sighs work faster), not the intense autonomic challenge WHM breathing provides, and not the sleep-specific intervention (extended exhale techniques like 4-7-8 are more targeted there). It’s the daily maintenance practice that, over weeks and months, shifts the autonomic baseline and improves cardiovascular metrics.
In the context of meditation practice, nadi shodhana is a traditional preparation for seated meditation — settling the nervous system and focusing attention on the breath, making the transition to formal meditation easier. Many practitioners who struggle to establish a meditation habit find that starting each session with five minutes of alternate nostril breathing makes the mental settling required for meditation more accessible.
For anxiety management, alternate nostril breathing works as both a daily baseline practice and an acute intervention, but its effects are slower-onset than box breathing or physiological sighs. Acute anxiety needing immediate relief calls for three physiological sighs (double inhale through the nose, extended exhale through the mouth) for faster relief. Improving the anxiety baseline over weeks of practice — nadi shodhana is one of the most evidence-supported tools available.
For blood pressure management, the daily practice approach is essential — the Telles research and related clinical evidence shows acute effects within a single session, but cumulative effects from consistent daily practice over weeks appear meaningfully larger. Priya’s cardiologist was right: it takes six weeks to see the full effect, and consistency matters more than session duration. Five minutes daily beats thirty minutes twice a week.
Left Nostril Versus Right Nostril: The Practical Asymmetry
One of the more fascinating implications of nasal cycle physiology and the Telles research: specific unilateral nostril breathing can serve as a targeted intervention for specific functional states — not just alternating between them. This is the advanced application of what alternate nostril breathing teaches about the left-right asymmetry of the respiratory system.
Right nostril breathing — blocking the left nostril, breathing exclusively through the right for three to five minutes — has been shown in multiple studies to increase sympathetic activity, elevate heart rate moderately, and increase spatial processing performance and verbal fluency on the left hemisphere’s terms. Raghuraj and Telles (2008) showed that thirty minutes of right-nostril breathing increased oxygen consumption by 37% compared to baseline and to left-nostril breathing — a remarkable metabolic activation effect from breathing mechanics alone. This suggests right nostril breathing is a legitimate mild stimulant that activates rather than calms.
The practical use cases: right nostril breathing as a caffeine-free alertness tool before demanding cognitive work or exercise; right nostril breathing to counteract afternoon energy slumps; right nostril breathing as preparation for high-stakes performance situations where heightened arousal is beneficial.
Left nostril breathing — blocking the right nostril, breathing exclusively through the left — produces the opposite profile. The literature confirms decreased heart rate, lower sympathetic markers, improvements in spatial tasks associated with right hemisphere dominance. Anecdotally, left nostril breathing is widely used in yogic practice as a pre-sleep calming technique and as an acute anxiety reduction method. The research base for acute parasympathetic activation through left nostril breathing is credible enough to recommend it as a practical tool.
The practical use cases: left nostril breathing for five minutes before sleep to support the autonomic downregulation required for sleep onset; left nostril breathing during acute stress to produce a rapid parasympathetic shift; left nostril breathing during a difficult emotional conversation to reduce reactive arousal and improve access to the more measured, right-hemisphere processing style.
This asymmetry framework makes the alternating technique make more sense as a “balancing” practice rather than just a breathing exercise — literally cycling between the two poles of autonomic activation in a controlled way, training both branches and their transition fluidity, which is precisely what heart rate variability measures as the indicator of autonomic health.
Building a Daily Practice: Environment and Timing
The gap between knowing a breathing practice and actually doing it daily is where most people fall short. The protocol is easy. The consistency is the work. These environmental and timing strategies are designed to close that gap.
Anchor it to an existing habit. The most reliable way to establish a new daily practice is attaching it to something already done without fail. Morning coffee or tea is a natural anchor — sit quietly with the drink, do five to fifteen minutes of nadi shodhana while it cools, then drink it. The association transfers the habit’s inertia to the new practice over two to four weeks until it becomes equally automatic.
Set environmental cues. Keep whatever serves as a visual reminder — a meditation cushion, a specific chair, a yoga mat in a corner — visible and accessible. Eliminating environmental friction (having to set up before starting) is a more reliable habit predictor than motivation or discipline. Moving furniture and hunting for a mat means it won’t happen on low-motivation days. Mat already out, chair already there — activation cost near zero.
Morning is typically optimal. Cortisol peaks in the first hour after waking — the cortisol awakening response — and practicing nadi shodhana during or just after this window has maximum potential to shape autonomic tone for the rest of the day. Evening practice has strong sleep-onset benefits. Both are valid; morning is often more sustainable because fewer obligations compete for the time and because evening practice requires enough energy to do properly, which isn’t always guaranteed.
Track the practice, not the outcomes. Don’t measure blood pressure every day and judge the practice by whether it dropped. Too noisy — blood pressure varies significantly day to day based on hydration, sleep, stress, and a dozen other variables. Track the practice itself: mark a calendar for each day a session is completed. When the chain gets long enough, skipping starts to feel like breaking something. At six weeks, do an objective assessment — compare resting heart rate and blood pressure averages against the pre-practice baseline.
The Research Horizon: What We Don’t Yet Know
Alternate nostril breathing has a promising research base, but like most non-pharmaceutical health interventions, the evidence base has significant gaps worth factoring into how confidently the findings get interpreted.
Most studies are short-term — weeks to a few months. The long-term effects of sustained daily practice on cardiovascular outcomes, autonomic function, and cognitive performance are largely unstudied. The evidence suggests directionally positive effects are likely to persist and possibly compound, but that’s inference, not established fact.
Sample sizes in most pranayama studies are small, typically twenty to sixty participants. Effect sizes may be overestimated in small-sample research due to publication bias and regression to the mean. The blood pressure effects Telles reported are clinically meaningful in direction, but whether they replicate consistently in larger, more diverse populations hasn’t been fully tested.
Mechanism research is incomplete. Plausible mechanisms exist — nasal trigeminal and olfactory nerve stimulation, autonomic reflex arcs, resonance frequency breathing effects — but the specific pathway by which left versus right nostril airflow produces hemispheric and autonomic asymmetry effects isn’t definitively established. This doesn’t undermine the observed effects, but it means working from association and mechanistic hypothesis rather than fully characterized causal pathways.
What the research gaps don’t change: alternate nostril breathing is safe, inexpensive, accessible, and has a credible enough evidence base to be a reasonable daily practice for virtually any adult interested in cardiovascular and stress management benefits. The downside is negligible; the potential upside is real. A favorable risk-benefit calculation by any reasonable standard.
Why Most People Quit Breathwork Practices and How Not To
There’s a consistent pattern in how breathwork practices fail for most people who try them. Enthusiasm at the start, the practice for one to three weeks, some subjective benefit noticed, then gradual deprioritization when life gets busy. Eventually circling back means starting over from a lost baseline. The practice never compounds. It just resets, repeatedly.
The first problem is expectation mismatch. People start alternate nostril breathing expecting dramatic acute effects — a sudden, obvious sense of calm, a dramatic blood pressure reading, a visible transformation. These acute effects exist and are real, but modest in any single session. The meaningful benefit is cumulative — the baseline autonomic shift accumulating over consistent weeks of practice. Expecting to feel dramatically different after session one sets up disappointment and lost motivation.
Set the expectation correctly from day one: this is building a physiological adaptation, not experiencing a drug effect. Five minutes today compounds over sixty days into something measurable. Today’s session is investment, not payoff. This expectation reframe matters more than any technique detail for long-term practice sustainability.
The second problem is perfectionism. Sessions get skipped when only three minutes are possible instead of the planned fifteen, or when too tired to do it “properly,” or without access to the usual quiet space. The solution is minimum viable practice: on hard days, even one minute of alternate nostril breathing counts. The neural pathway and the habit stay active. Don’t let perfect be the enemy of daily. Three minutes on a chaotic Tuesday beats zero minutes and broken consistency.
The third problem is isolation — treating breathwork as a standalone intervention and measuring it against a metric it was never going to hit alone. Alternate nostril breathing will not eliminate anxiety, fix blood pressure, or resolve insomnia by itself. It’s one input into a system. Poor sleep, poor diet, no exercise, and severe chronic stress alongside it means the breathwork is fighting against all of those headwinds. The appropriate expectation is a modest directional improvement in autonomic function, meaningful as part of a comprehensive approach — not a standalone cure.
Priya, from the opening, had all three of these risks working against her. Her cardiologist helped her calibrate expectations appropriately — six weeks to show up in her blood pressure readings, not two. She started with just five minutes a day, easy enough that she never skipped it. And she was also making other lifestyle changes — better sleep, reduced sodium, consistent walking — so the breathwork had allies rather than headwinds. The blood pressure drop was real. Whether it traces entirely to the nadi shodhana or partly to the other changes is impossible to say. The answer doesn’t particularly matter. It worked, and it would have been less likely to work without the other pieces in place.
FAQ: Alternate Nostril Breathing
How long should I practice alternate nostril breathing each day?
The Telles 2013 study used fifteen to twenty minute sessions. Clinically meaningful effects have been observed in sessions as short as five minutes in some studies. For beginners, five to ten minutes daily is a sustainable starting point producing measurable benefit. Build to fifteen to twenty minutes over several weeks if the schedule allows. Consistency over time matters more than session length — daily five-minute sessions outperform sporadic twenty-minute sessions for cumulative autonomic benefit.
Can alternate nostril breathing lower blood pressure as effectively as medication?
No — at least not for most people with clinically significant hypertension. The blood pressure reductions observed in research (typically 5-10 mmHg systolic in healthy or mildly hypertensive populations) are meaningful as an adjunct but insufficient as primary treatment for stage 2 hypertension. Alternate nostril breathing is most appropriately used alongside medical management, not instead of it. For borderline or stage 1 hypertension, lifestyle modifications including breathwork may be sufficient as a primary intervention — a discussion to have with a physician, not a decision to make unilaterally.
Should you hold your breath between nostrils?
In the basic technique described here, no. Breath retention (kumbhaka) is a more advanced technique with different physiological effects and greater risk potential. Begin with the retention-free alternating technique and practice it for at least several weeks before exploring retention variants, ideally with guidance from a qualified instructor who can assess readiness for more advanced protocols.
Which nostril should I start with?
Traditional instruction begins with the left nostril (closing the right). Most clinical studies use this convention. Starting with the left (parasympathetic-associated) nostril first is thought to support a calming orientation to the practice. For most people, which nostril to start with matters less than practicing consistently — but starting from scratch, left-nostril initiation is the convention for good reasons.
Can children practice alternate nostril breathing?
Yes, with appropriate instruction and supervision. Nadi shodhana is practiced in some yoga education programs for children aged eight and older. The technique is simple enough to be learned at this age, and the stress-reduction benefits apply regardless of age. No known safety concerns for healthy children. For children with respiratory conditions (asthma, chronic nasal obstruction), medical review before beginning is appropriate.
Is alternate nostril breathing the same as pranayama?
Nadi shodhana is one pranayama technique among many. Pranayama is the broader yogic practice of breath regulation, including techniques ranging from simple breath awareness through complex retention sequences and forced breathing methods like kapalabhati and bhastrika. Alternate nostril breathing is often described as the central or most balanced pranayama technique in classical yoga texts, but it’s one component of a much larger system rather than the whole of pranayama.
The Practical Framework: Applying Alternate Nostril Breathing Science In Real Life
References
Editorial StandardsCorrectionsMedical DisclaimerAbout Our ContentAffiliate DisclosureSite Map