At 416, air quality remains ‘severe’ in Delhi

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Several schools and colleges have been shut on Thursday in view of the deteriorating pollution level in the national capital. Photo: PTI

Pollution levels, in the national capital New Delhi, continued to be in the “severe” category on Wednesday (October 30) as a blanket of smog wrapped the city.

According to the Central Pollution Control Board (CPCB), the air quantity index was 416 at 11 am.

On Tuesday, the overall air quality index was 414 at 8 pm, worse than Monday’s AQI of 397, according to the CPCB.

An AQI between 0-50 is considered “good”, 51-100 “satisfactory”, 101-200 “moderate”, 201-300 “poor”, 301-400 “very poor”, and 401-500 “severe”. Above 500 is “severe-plus emergency” category.

The AQI takes into account five chief pollutants — particulate matter with a diameter less than 10 micrometres (PM10), PM2.5, ozone (O3), nitrogen dioxide (NO2), and carbon monoxide (CO).

The higher the AQI value, the greater the level of air pollution and the greater the health concern.

(With inputs from agencies)