Cheyyar Air Quality Index (AQI) & Air Pollution Today

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

Cheyyar AQI Right Now

58

Category: Satisfactory

Dominant Pollutant: pm10

PM2.5: 21.8 µg/m³

PM10: 57.13 µg/m³

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

Cheyyar Pollutant Levels

PollutantConcentration
PM2.521.8 µg/m³
PM1057.13 µg/m³
O₃ (Ozone)8.35 µg/m³
NO₂12.09 µg/m³
SO₂2.43 µg/m³
CO550.89 µg/m³

Health Advisory — Cheyyar

Satisfactory: Minor breathing discomfort to sensitive people.

Health Impact — Cheyyar

Cigarette Equivalent: Breathing this air is equivalent to smoking 1 cigarettes per day (based on current PM2.5 levels).

Life Expectancy Impact: Sustained exposure at this PM2.5 level could reduce life expectancy by 0.08 years (AQLI estimate, relative to WHO guideline of 5 µg/m³).

Health Recommendations for Cheyyar

  • General Population: Acceptable air quality. Unusually sensitive people should limit prolonged outdoor exertion.
  • Elderly: Minor breathing discomfort is possible.
  • Children: Should be fine outdoors with normal activities.
  • Lung Disease Patients: Consider reducing prolonged outdoor exertion.

Understanding Cheyyar Air Quality

Cheyyar's air quality is significantly influenced by its role as a transport junction, with highways connecting Chennai, Tiruvannamalai, and Vellore converging at the town. This creates continuous heavy vehicle traffic that generates diesel emissions, tire and brake dust, and road particulates throughout the day. During winter months from November to February, stable atmospheric conditions trap these transport-related emissions, creating elevated PM2.5 and PM10 levels particularly along highway corridors. Goods vehicles idling at junction points and commercial areas contribute additional diesel fumes and particulates.

The town experiences peak traffic during morning and evening hours, but as a 24-hour transport corridor, emissions continue through night hours when atmospheric mixing is minimal. Construction activity related to highway widening and junction improvements adds dust that combines with vehicular emissions. Agricultural burning in surrounding villages during harvest seasons contributes episodic smoke that overlays the baseline transport pollution. Summer months from March to May see elevated dust from roads and construction, exacerbated by heavy vehicle movement. The northeast monsoon from October to December provides the year's best air quality through rainfall that suppresses dust and washes particulates, though the return of dry conditions quickly restores pollution levels typical of a busy transport corridor.

Primary Pollution Sources

  • Highway vehicular emissions
  • Transport junction diesel fumes
  • Construction and road dust
  • Agricultural biomass burning
  • Commercial and residential activities

Geography: Transport junction town at intersection of major highways, with heavy goods vehicle traffic and commercial activity.

Peak pollution months: November, December, January, February

Frequently Asked Questions — Cheyyar

Why is Cheyyar's air quality affected by transport?

Cheyyar is a major transport junction where highways connecting Chennai, Tiruvannamalai, and Vellore intersect. This brings continuous heavy goods vehicle traffic that generates diesel emissions, tire and brake dust, and road particulates. The 24-hour nature of transport operations means emissions continue even during night hours, with pollution most concentrated during winter months when atmospheric dispersion is limited.

How does highway traffic compare to city traffic for air pollution?

Highway traffic, especially heavy goods vehicles, produces significant diesel particulate emissions and higher levels of PM2.5 due to sustained high-speed operation. While city traffic involves more frequent stops and starts, highway corridors see continuous emission streams from trucks and buses. In Cheyyar, the concentration of multiple highway routes through a small town creates pollution levels comparable to larger urban areas despite the smaller population.

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