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Chennai AQI Today

125US AQI
Unhealthy for Sensitive Groups

The current Air Quality Index in Chennai, Tamil Nadu, India is 125, which is considered unhealthy for sensitive groups. The fine particulate (PM2.5) concentration is 15.7 µg/m³.

Last updated · Source: CAMS forecast model

Pollutant levels in Chennai

PM2.515.7 µg/m³Fine particulate matter
PM1019.4 µg/m³Coarse particulate matter
O₃119 µg/m³Ozone
NO₂6.3 µg/m³Nitrogen dioxide
SO₂9.9 µg/m³Sulphur dioxide
CO198 µg/m³Carbon monoxide

Health advice

Members of sensitive groups — children, older adults, and people with respiratory or heart conditions — may experience health effects. They should limit prolonged outdoor exertion.

7-day AQI trend

DayAQICategory
Sep 30121Unhealthy for Sensitive Groups
Oct 192Moderate
Oct 279Moderate
Oct 392Moderate
Oct 469Moderate
Oct 564Moderate
Oct 677Moderate

About the Air Quality Index

The Air Quality Index (AQI) converts measured pollutant concentrations — including PM2.5, PM10, ozone (O₃), nitrogen dioxide (NO₂), sulphur dioxide (SO₂), and carbon monoxide (CO) — into a single 0–500 scale. Higher values mean greater health risk. The reading for Chennai reflects a CAMS forecast model and updates throughout the day. Learn what the AQI number means for your body, read the AQI scale reference, see what to do at today’s AQI, or compare PM2.5 and PM10.

Frequently asked questions about Chennai air quality

What is the AQI in Chennai today?

The current Air Quality Index in Chennai, Tamil Nadu, India is 125 on the 0–500 US AQI scale, which is categorised as unhealthy for sensitive groups. The reading comes from a CAMS forecast model and refreshes throughout the day.

What is the PM2.5 level in Chennai right now?

Fine particulate matter (PM2.5) in Chennai, Tamil Nadu, India is currently 15.7 µg/m³. The World Health Organization recommends keeping the 24-hour average below 15 µg/m³, so Chennai is currently above the WHO guideline.

Is it safe to go outside in Chennai today?

Members of sensitive groups — children, older adults, and people with respiratory or heart conditions — may experience health effects. They should limit prolonged outdoor exertion.

What is considered a good AQI level?

An AQI of 0–50 is good, 51–100 is moderate, 101–150 is unhealthy for sensitive groups, 151–200 is unhealthy, 201–300 is very unhealthy, and anything above 300 is hazardous. The scale is the same everywhere, so readings are directly comparable between cities.

How often is the Chennai air quality data updated?

Air quality readings for Chennai, Tamil Nadu, India refresh throughout the day, and this page is rendered fresh on every visit, so the AQI, pollutant breakdown and 7-day trend always reflect the latest available model output.

Air quality near Chennai

Compare Chennai with the closest monitored cities — pollution is regional, so neighbouring readings often move together.

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