Siwan · Live air quality
You're looking at Siwan's air right now — AQI 337, very poor, driven by PM2.5.
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Siwan Air Quality Index (AQI) Today
Live air quality in Siwan, — real-time AQI, dominant pollutant, PM2.5 & PM10 levels and a plain-English health advisory, computed from CPCB data.
No — Siwan's AQI is 337 (Very Poor). Avoid outdoor activity, keep windows closed, run a purifier and wear an N95 mask outdoors.
Where 337 sits on the India CPCB scale
Siwan air quality forecast
22°C · wind 2 km/hLight winds (2 km/h) and calm air are letting pollution build up near the ground.
Hourly AQI forecast for the next 24 hours (CPCB scale).
Cleanest air today is forecast around 20:00 (AQI 334) — a good window for outdoor time.
Forecast modelled by Open-Meteo and converted to the CPCB scale. Forecasts are estimates and can change — our live readings above are measured.
What you can do outside right now
General guidance by AQI band. Sensitive groups should act one level earlier.
Live pollutant levels
Each pollutant's 24-hour concentration is converted to a CPCB sub-index; the city AQI is the highest of them (the dominant pollutant). Bars show the sub-index out of 500.
What this air does to your body
Illustrative equivalences from published research (Berkeley Earth; Air Quality Life Index, University of Chicago). Not a medical assessment of your personal risk.
24-hour AQI graph
min 337 · max 366Hourly AQI recorded each hour by DailyAQI (local time). Fills to a rolling 24 hours.
7-day AQI trend
Daily peak AQI recorded by DailyAQI since tracking began, coloured by category. History grows to a rolling 30 days.
Air quality calendar
Worst recorded day: 2026-11-07 (AQI 366) · cleanest: 2026-10-31 (AQI 80)
Each cell is a day, coloured by that day’s peak AQI band. Only days we have recorded are shown; the grid fills out over the month.
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What Very Poor air means for you
May cause respiratory illness on prolonged exposure; effects more pronounced for people with lung and heart disease.
Health guidance per CPCB National Air Quality Index bands. Informational only — not medical advice.
India's metro cities right now
AQI categories (India scale)
| AQI | Category | Associated health impact |
|---|---|---|
| 0–50 | Good | Air quality is considered satisfactory and air pollution poses little or no risk. |
| 51–100 | Satisfactory | Acceptable air quality; minor breathing discomfort possible for unusually sensitive people. |
| 101–200 | Moderate | May cause breathing discomfort to people with lung disease such as asthma, and to children and older adults. |
| 201–300 | Poor | May cause breathing discomfort to most people on prolonged exposure. |
| 301–400 | Very Poor | May cause respiratory illness on prolonged exposure; effects more pronounced for people with lung and heart disease. |
| 401–500 | Severe | Affects healthy people and seriously impacts those with existing diseases; avoid outdoor activity. |
Monitoring location
Approximate location of the monitoring station(s) feeding this reading. Map © OpenStreetMap.
About air quality in Siwan
This page tracks the Siwan Air Quality Index using measurements from a Central Pollution Control Board (CPCB) monitoring station, published through the Government of India's open-data portal. Right now Siwan's AQI is 337 (Very Poor), with PM2.5 the dominant pollutant. The AQI is a single number from 0 to 500 that summarises how polluted the air is and what it means for health, built from pollutants such as fine particulate matter (PM2.5), coarse particulate matter (PM10), nitrogen dioxide, ground-level ozone and sulphur dioxide — the index reflects whichever is worst at the time.
How Siwan's air changes through the year
Air quality in Siwan changes through the day and across the seasons. Levels are usually worse in the early morning and late evening when cooler, calmer air traps pollutants near the ground, and they tend to rise in the cooler months when inversions are more common; the monsoon typically brings the cleanest air as rain washes particulates away.
What drives air pollution in Siwan
Traffic, construction and road dust, industry and the burning of solid fuels are the main local sources, with regional factors and winter weather adding to the load when the air is calm.
Best time to visit Siwan for cleaner air
For the cleanest air, the monsoon and the months just after it are usually best in Siwan, while the driest, stillest weeks can be worse. Check the live reading on this page before outdoor exercise or sightseeing, and keep an N95 mask handy for high-pollution days. Nearby cities with comparatively cleaner air right now include Madikeri, Srinagar, Thoothukudi.
Staying safe in Siwan's air
When the AQI is in the Good or Satisfactory range, outdoor activity is fine for almost everyone. From Moderate upward, sensitive groups — children, older adults, pregnant people and anyone with asthma or heart disease — should pace themselves outdoors, and once the air turns Poor or worse it is sensible for everyone to limit strenuous outdoor exertion, keep windows closed, run an air purifier indoors and wear a well-fitting mask outside. This is general information rather than medical advice. We only display a number when a recent station reading exists — if you see "data updating", we are waiting on a fresh value rather than showing an estimate.
Air quality near Siwan
The nearest monitored cities to Siwan, with their live AQI — tap any card for its full report.
Protect your health — air quality guides
Frequently asked questions
What is the AQI in Siwan today?
The current Air Quality Index in Siwan is 337 (Very Poor) on the Indian CPCB scale, with PM2.5 as the dominant pollutant.
Is it safe to go outside in Siwan today?
No — Siwan's AQI is 337 (Very Poor). Avoid outdoor activity, keep windows closed, run a purifier and wear an N95 mask outdoors.
What is the main pollutant in Siwan?
Today the dominant pollutant driving Siwan's AQI is PM2.5. The full pollutant breakdown (PM2.5, PM10, NO₂, O₃, CO, SO₂) is listed above.
How is Siwan's AQI calculated?
Each pollutant's 24-hour concentration is converted to a sub-index using CPCB breakpoints; the city AQI is the highest sub-index. See our methodology.
What is the air quality forecast for Siwan tomorrow?
Air in Siwan is forecast to stay similar tomorrow, around AQI 358 (Very Poor). Forecasts are modelled estimates (Open-Meteo) and can change.