Katihar, · Live air quality
You're looking at Katihar's air right now — AQI 40, good, driven by PM2.5.
Cities › Katihar
Katihar Air Quality Index (AQI) Today
Live air quality in Katihar, — real-time AQI, dominant pollutant, PM2.5 & PM10 levels and a plain-English health advisory, computed from CPCB data.
Yes — air quality in Katihar is good today (AQI 40). Outdoor activity is generally fine.
Where 40 sits on the India CPCB scale
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 40 · max 48Hourly 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
A colour-coded calendar of daily air quality builds here as we record each day — check back as the month fills in.
Make it personal
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Alert me when the air turns unhealthy
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What Good air means for you
Air quality is considered satisfactory and air pollution poses little or no risk.
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 Katihar
This page tracks the Katihar Air Quality Index using measurements from Central Pollution Control Board (CPCB) monitoring stations, published through the Government of India's open-data portal. The AQI is a single number from 0 to 500 that summarises how polluted the air is and what it means for health, based on the concentrations of key pollutants — fine particulate matter (PM2.5), coarse particulate matter (PM10), nitrogen dioxide (NO₂), ground-level ozone (O₃), carbon monoxide (CO) and sulphur dioxide (SO₂).
Air quality in Katihar changes through the day and across seasons. Levels are typically worse in the early morning and late evening when cooler, calmer air traps pollutants near the ground, and across North India they rise sharply in winter (roughly October to February) when temperature inversions, crop-residue burning and festival activity combine. Summer and the monsoon usually bring cleaner air as rain washes out particulates and stronger winds disperse them. Checking the current reading before outdoor exercise, a school run or a commute helps you decide whether to adjust timing, wear a mask, or keep windows closed.
We only display a number when a recent station reading exists — if you see "data updating", it means we are waiting on a fresh value rather than showing an estimate.
Frequently asked questions
What is the AQI in Katihar today?
The current Air Quality Index in Katihar is 40 (Good) on the Indian CPCB scale, with PM2.5 as the dominant pollutant.
Is it safe to go outside in Katihar today?
Yes — air quality in Katihar is good today (AQI 40). Outdoor activity is generally fine.
What is the main pollutant in Katihar?
Today the dominant pollutant driving Katihar's AQI is PM2.5. The full pollutant breakdown (PM2.5, PM10, NO₂, O₃, CO, SO₂) is listed above.
How is Katihar'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.