Noida (UP), Jan 25 (PTI) The air quality was recorded as “very poor” in Ghaziabad, Noida, Greater Noida and Faridabad while it was 'poor' in Gurgaon for the second day in a row, according to data issued by a government agency on Monday.
Pollutant 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).
According to the index, 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 4 pm on Monday was 360 in Ghaziabad, 352 in Noida, 372 in Greater Noida, 336 in Faridabad and 280 in Gurgaon, according to CPCB's Sameer app.
On Sunday, it was 390 in Ghaziabad, 322 in Noida, 388 in Greater Noida, 353 in Faridabad and 300 in Gurgaon.
The CPCB states that an AQI in the “very poor” category may cause respiratory illness on prolonged exposure, while 'poor' causes breathing discomfort to most people on prolonged exposure.
The AQI for each city is based on the average value of all monitoring stations there. Ghaziabad, Gurgaon and Noida have four such stations while Greater Noida and Faridabad have two stations each, according to the app. PTI KIS RDM RDM