Presence of pollutant PM 2.5 and PM 10 also remained high in 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 Thursday was 277 in Ghaziabad, 283 in Greater Noida, 267 in Noida, 213 in Faridabad and 241 in Gurgaon, according to the CPCB’s Sameer app.
The CPCB states that an AQI in the “poor” category may cause breathing discomfort to people.
The average AQI on Wednesday was 319 in Ghaziabad, 331 in Greater Noida, 280 in Noida, 222 in Faridabad and 221 in Gurgaon.
The AQI for each city is based on the average value of all stations there. Noida, Faridabad, Ghaziabad have four stations each, while Gurgaon has three and Greater Noida two, according to the app.
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