Air quality poor in Noida, Ghaziabad, Gurugram and Faridabad. (file photo)
NOIDA: The average air quality was very poor in Greater Noida and poor in Ghaziabad, Noida, Faridabad and Gurugram on Sunday, according to a 24-hour data provided by a government agency.
Pollutants PM 2.5 and PM 10 remained prominent in the air of the five immediate neighbours of Delhi, according to the air quality index (AQI) maintained by the Central Pollution Control Board (CPCB).
An AQI between zero and 50 is considered good , 51 and 100 satisfactory , 101 and 200 moderate , 201 and 300 poor , 301 and 400 very poor , and 401 and 500 severe .
The average 24-hour AQI at 4pm on Sunday was 280 in Ghaziabad, 311 in Greater Noida, 239 in Noida, 251 in Faridabad and 215 in Gurugram, according to CPCB s Sameer app.