Sitamarhi Air Quality Index (AQI) & Air Pollution Today

Bihar, India — Real-time Air Quality Index (AQI) and PM2.5

Sitamarhi AQI Right Now

131

Category: Moderate

Dominant Pollutant: pm25

PM2.5: 69.1 µg/m³

PM10: 87.58 µg/m³

Last updated: 2026-03-24 — Data source: Google Air Quality API (NAQI). Live NAQI values load when you visit the page.

Sitamarhi Pollutant Levels

PollutantConcentration
PM2.569.1 µg/m³
PM1087.58 µg/m³
O₃ (Ozone)13.07 µg/m³
NO₂6 µg/m³
SO₂2.01 µg/m³
CO777.91 µg/m³

Health Advisory — Sitamarhi

Moderate: Breathing discomfort to people with lungs, asthma and heart diseases.

Health Impact — Sitamarhi

Cigarette Equivalent: Breathing this air is equivalent to smoking 3.1 cigarettes per day (based on current PM2.5 levels).

Life Expectancy Impact: Sustained exposure at this PM2.5 level could reduce life expectancy by 0.38 years (AQLI estimate, relative to WHO guideline of 5 µg/m³).

Health Recommendations for Sitamarhi

  • General Population: People with respiratory or heart conditions should limit prolonged outdoor exertion.
  • Elderly: Reduce prolonged outdoor activities.
  • Children: Reduce prolonged outdoor play.
  • Lung Disease Patients: Avoid prolonged outdoor exertion.

Understanding Sitamarhi Air Quality

Sitamarhi is a town of profound religious importance in north Bihar, revered by Hindus as the birthplace of Goddess Sita (Sita Janma Sthan), making it a year-round pilgrimage destination. Located just 8 kilometres from the Nepal border with an active international checkpoint, the town also functions as a significant cross-border trade hub. The Lakhandei River flows through the town, and the terrain is quintessentially flat north Bihar Terai — alluvial, moisture-rich, and prone to severe winter fog. Pilgrimage traffic and border commerce combine to create vehicular emission levels disproportionate to the town's modest population.

The October–January window brings the worst air quality. Border trade intensifies during the festival and wedding season, pushing diesel truck and bus traffic through the town's narrow roads. Pilgrims visiting Sita Janma Sthan arrive in large numbers during Vivah Panchami (November–December), generating concentrated vehicular and foot-traffic congestion. Domestic biomass burning is pervasive in the town's residential areas, with dung cakes and wood as primary winter fuels. Brick kilns on the periurban belt, rice stubble burning from surrounding fields, and open waste burning in the absence of modern municipal waste management all add to the PM2.5 burden. Dense fog from the flat, moisture-rich Terai terrain traps these emissions for days at a time.

Monsoon rains (June–September) bring dramatic air quality improvement with 1,200–1,400 mm of rainfall, though the Lakhandei River and tributaries flood frequently, disrupting border trade and daily life. Pre-monsoon months (March–May) see rising heat and moderate dust. Sitamarhi's dual identity as pilgrimage centre and border trade town means pollution management must consider both religious tourism traffic and commercial transit emissions.

Primary Pollution Sources

  • Vehicle exhaust from border trade
  • Domestic biomass burning
  • Brick kilns
  • Agricultural burning
  • Open waste burning

Geography: India-Nepal border town in north Bihar; Hindu pilgrimage site as Sita Janma Sthan (birthplace of Goddess Sita), Lakhandei River, flat Terai terrain, transit trade hub

Peak pollution months: October, November, December, January

Frequently Asked Questions — Sitamarhi

How does pilgrimage activity affect Sitamarhi's air quality?

Sitamarhi's status as Sita Janma Sthan (birthplace of Goddess Sita) draws continuous pilgrimage traffic, with peaks during Vivah Panchami (November–December) and Ram Navami (March–April). Large numbers of diesel buses, cars, and auto-rickshaws converge on the temple area, creating concentrated vehicular emissions in a small zone. Religious ceremonies involving fire offerings (havans) add localised smoke, though their contribution to overall air quality is modest compared to vehicular and biomass sources.

Does the India-Nepal border crossing impact Sitamarhi's air pollution?

Yes — the active border checkpoint near Sitamarhi channels heavy commercial vehicle traffic through the town. Diesel trucks carrying goods for cross-border trade idle at checkpoints and queue along approach roads, generating concentrated exhaust emissions. The festival and wedding season (October–January) sees peak trade volumes coinciding with winter inversion conditions, amplifying the impact of this transit traffic on local air quality.

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