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The main measure of air quality is the concentration of fine particles or Particulate Matter that has a diameter less than 2.5 micrometers it is called PM2.5.

Understanding the numbers

An AQI between 150 and 200 is unhealthy; between 350 and 500 is classified as very

3 Dec 2017 12:19 AM IST

Severe air quality affects healthy people and seriously impacts those with existing diseases.

50 students hit streets to study Delhi air quality

The data collected will be used by them to prepare an action plan in each of these areas.

25 April 2017 2:21 AM IST

National Green Tribunal

Introduce destination buses: NGT to AAP govt

It said these services would start from spots where it is convenient for the public at large.

21 April 2017 1:25 AM IST

A traffic policeman, wearing an anti-pollution mask,controls traffic amid smog and air pollution which continues to be above dangerous level.

Delhi air quality detoriates again

The city's average Air Quality Index (AQI) Friday, however was 217, on a scale of 500, classified as 'poor'.

9 Dec 2017 8:48 AM IST

The researchers will focus on 360 youngsterswith asthma to examine the level of exercise they can tolerate amid air pollution.

City's air quality improves slightly

The air quality on Tuesdasy rose to poor' category as the rains washed off some of the pollutants in the air.

13 Dec 2017 2:19 AM IST

Two women wear masks on a street in Beijing amid a high alert over increasing air pollution. (Photo: AFP)

China: Principal penalized for organizing outdoor exam

More than 20 cities in north China including capital Beijing issued red alerts for the latest bout of polluted air.

21 Dec 2016 7:53 PM IST