Air quality in Siliguri
How bad is the air in Siliguri?
Siliguri’s 2025 average of AQI 84 is Satisfactory on the CPCB scale, and the median day was 66. 98 days crossed 100 (Moderate or worse) and 18 crossed 200 (Poor or worse).
The peak was AQI 285 on 1 April 2025. Coarse dust (PM10) set the index on 60% of days.
When Siliguri’s air is worst
February is the worst month at a mean of AQI 162; July the cleanest at ~40. A dry-season peak — dust and dispersion, not the northern winter smog.
Plan around the profile, not the average: a purifier sized for February covers the rest of the year with headroom, and windows can be opened in July.
Pollution in Siliguri: what drives it
Across West Bengal, the usual drivers of poor air are vehicle exhaust, construction and road dust, biomass and stubble burning in the post-monsoon months and winter temperature inversion that traps pollution. CPCB bulletins name coarse dust (PM10) as the prominent pollutant on 60% of 2025's days.
- vehicle exhaust
- construction and road dust
- biomass and stubble burning in the post-monsoon months
- winter temperature inversion that traps pollution
How Siliguri compares
Among the 62 cities we map, Siliguri has the 25th lowest annual AQI, against a median of 94 across those cities.
Elsewhere in West Bengal, Kolkata averaged AQI 99.
See the full ranking on the India Air Quality Index by city.
Do you need an air purifier in Siliguri?
Verdict
For the worst months, yes — Siliguri is a seasonal case.
98 days in 2025 were Moderate or worse, concentrated around February. A single well-sized unit in the bedroom, run through those months, covers most of the exposure; the rest of the year it is optional unless someone at home has asthma or allergies.
What actually works
- Size by volume, not the box. Coverage claims assume ~2 air changes an hour; a February night wants 5.
- Bedroom first. Eight closed-door hours a night is where a purifier makes its measurable difference.
- Watch the live number. On Good and Satisfactory days, ventilate; on Poor days, close up and run the unit at the speed that delivers its CADR.
06 · The other half
Water in Siliguri
Groundwater near Siliguri averages ~269 mg/L TDS on CGWB monitoring — ideal on the BIS scale. The same government-data report, for what you drink.
Air
AQI 84
Satisfactory
Water
269 mg/L
TDS · Ideal
Siliguri air — questions
What is the AQI in Siliguri today?
Today's figure comes from CPCB's live station feed and is shown at the top of this page, updated hourly when the feed is reachable. For context, Siliguri averaged AQI 84 across 2025 and peaked at 285 on 1 April 2025, so a single day's reading should be judged against that range.
How bad is air pollution in Siliguri?
Siliguri's 2025 average of AQI 84 sits in CPCB's "Satisfactory" band. 18 days were Poor, Very Poor or Severe, and 250 days were Good or Satisfactory, out of 348 bulletin days.
Which month has the worst air quality in Siliguri?
February, with a monthly average of AQI 162 in 2025. July was the cleanest at ~40. The pattern follows local weather and the drivers below rather than the North Indian winter smog.
Is the air in Siliguri safe to breathe?
On average, yes: an annual AQI of 84 is within the "Satisfactory" band, where CPCB expects only minor discomfort for sensitive people. Individual days still crossed into Moderate or worse 98 times in 2025, so sensitive groups should watch the daily number.
Do I need an air purifier in Siliguri?
For the worst months, yes — Siliguri is a seasonal case. 98 days in 2025 were Moderate or worse, concentrated around February. A single well-sized unit in the bedroom, run through those months, covers most of the exposure; the rest of the year it is optional unless someone at home has asthma or allergies.
Where does Siliguri's air pollution come from?
Across West Bengal, the usual drivers of poor air are vehicle exhaust, construction and road dust, biomass and stubble burning in the post-monsoon months and winter temperature inversion that traps pollution. CPCB bulletins name coarse dust (PM10) as the prominent pollutant on 60% of 2025's days.
Where does this air quality data come from?
From the Central Pollution Control Board's daily AQI bulletin, published at 4 PM as a 24-hour average for each city with continuous monitoring stations. This page aggregates 348 bulletin days for Siliguri in 2025, drawn from 1 station. The live figure uses the same CPCB station network through the Government of India's open-data feed.
Air quality in other cities
Data sources
- CPCB Daily AQI Bulletin (4 PM, 24-hour average), 2025 — city-level National AQI, prominent pollutant and station counts
- CPCB National Air Quality Index (2014) — six-band scale used for all categories
- NAAQS 2009 (24-hour PM2.5 60 µg/m³, PM10 100 µg/m³) — the concentrations that mark the Satisfactory/Moderate boundary
- Live readings: CPCB real-time station feed via data.gov.in, refreshed hourly.
Primary dataset: Central Pollution Control Board (CPCB) National Air Quality Index, Government of India.
Disclaimer: Figures are city-level averages of the CPCB daily AQI bulletin for the year shown and may differ from the air at your address, which depends on traffic, construction and the nearest station. This page is general information, not medical advice; for respiratory or cardiac conditions consult a qualified professional. Any purifier guidance is general sizing advice, not a product recommendation.