Noida (UP), Feb 1 (PTI) The air quality deteriorated to reach 'severe' levels in Ghaziabad, 'very poor' in Noida, Greater Noida and Faridabad and 'poor' in Gurgaon, 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, the air quality index (AQI) maintained by the Central Pollution Control Board (CPCB) stated.
As per 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 412 in Ghaziabad, 369 in Noida, 384 in Greater Noida, 352 in Faridabad and 271 in Gurgaon, according to the CPCB's Sameer app.
On Sunday, it was 394 in Ghaziabad, 331 in Noida, 352 in Greater Noida, 311 in Faridabad and 303 in Gurgaon.
The CPCB states that an AQI in the “poor” causes breathing discomfort to most people on prolonged exposure, while “very poor” may cause respiratory illness on prolonged exposure. AQI in “severe” category affects healthy people and badly impacts those with existing diseases.
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 SNE SNE