Chennai Air Quality Index (AQI) & Air Pollution Today

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

Chennai AQI Right Now

45

Category: Good

Dominant Pollutant: pm25

PM2.5: 27.25 µg/m³

PM10: 34.91 µg/m³

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

Chennai Pollutant Levels

PollutantConcentration
PM2.527.25 µg/m³
PM1034.91 µg/m³
O₃ (Ozone)10.19 µg/m³
NO₂2.05 µg/m³
SO₂1.61 µg/m³
CO452.8 µg/m³

Health Advisory — Chennai

Good: Minimal impact on health. Great day to be outdoors!

Health Impact — Chennai

Cigarette Equivalent: Breathing this air is equivalent to smoking 1.2 cigarettes per day (based on current PM2.5 levels).

Life Expectancy Impact: Sustained exposure at this PM2.5 level could reduce life expectancy by 0.11 years (AQLI estimate, relative to WHO guideline of 5 µg/m³).

Health Recommendations for Chennai

  • General Population: Air quality is satisfactory. Enjoy outdoor activities.
  • Elderly: No special precautions needed.
  • Children: Great day for outdoor play.
  • Lung Disease Patients: No restrictions on outdoor activities.

Understanding Chennai Air Quality

Chennai, India's fourth-largest city, benefits from its coastal location on the Bay of Bengal which provides consistent sea breezes that disperse pollutants more effectively than landlocked cities. However, the city's northern industrial corridor - stretching from Manali through Ennore to the port - creates persistent localised pollution hotspots with elevated SO2 and PM10 from refineries, petrochemical plants, and coal-fired thermal power stations.

The driest months (January–March) see the worst air quality citywide, as the absence of rainfall allows dust and particulates to accumulate. PM2.5 concentrations during this period typically range from 50–100 µg/m³, with peaks above 120 µg/m³ near industrial zones. Chennai's vehicle fleet - exceeding 7 million - contributes significantly to NOx and PM2.5, especially along congested corridors like the GST Road, Anna Salai, and the IT Corridor (OMR).

The northeast monsoon (October–December) brings heavy rain that dramatically improves air quality, though post-rain waterlogging and waste decomposition can temporarily increase ground-level ozone. Summer months (April–June) see moderate air quality with occasional sea salt aerosol influence. The TNPCB monitors key industrial areas, and Chennai was among the first Indian cities to implement BS-VI fuel standards.

Primary Pollution Sources

  • Vehicle exhaust
  • Industrial emissions (Manali, Ennore)
  • Construction dust
  • Port and shipping emissions
  • Thermal power plant emissions (North Chennai)

Geography: Coastal city on the Bay of Bengal; sea breeze provides natural ventilation but industrial corridor in North Chennai creates localised hotspots

Peak pollution months: December, January, February, March

Frequently Asked Questions — Chennai

Is Chennai air quality better than Delhi?

Yes, significantly. Chennai's annual average AQI is typically 40–60% lower than Delhi's, thanks to its coastal location providing sea breeze ventilation; Delhi's landlocked position traps pollutants far more severely. Chennai's PM2.5 annual average is around 30–40 µg/m³ compared to Delhi's 100+ µg/m³.

What causes air pollution in Chennai?

Chennai's pollution comes from vehicular exhaust (7+ million vehicles), industrial emissions from the Manali-Ennore petrochemical and refinery corridor, port and shipping activity, North Chennai Thermal Power Station, construction dust, and road dust. The northern industrial belt has significantly worse air quality than the southern residential areas.

Air Quality in Nearby Cities