Medicine

Delhi-NCR's air quality improves slightly, but still "very poor"

Delhi-NCR's air quality improves slightly, but still

Air quality in Delhi has been hovering between the "poor" and "very poor" categories but was not "severe" since November 13. According to scientists and meteorologists, high relative humidity and low wind speed spiked pollution levels in the city.

A lot has been said for and against this since Sunday and Gautam Gambhir added his take to all of this, taking a dig at the political leadership as he highlighted the Air Quality Index "scorecard".

The cleanest air day this year and since air monitoring began in Mumbai was recorded on October 12, when the AQI was 32 (good).

On Wednesday, Chembur had the cleanest air in the city with AQI levels for PM2.5 at 22, while Navi Mumbai had the most polluted air with an AQI of 71. It is classified as "very poor".

Yesterday's 24-hour average was 351.

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An Air Quality Index between 0-50 is considered Good, 51-100 Satisfactory, 101-200 Moderate, 201-300 Poor, 301-400 Very Poor, and 401-500 Severe.

The concentration of particulate matter was well below the safe limit prescribed by the Central Pollution Control Board.

Cyclone Ockhi led to a significant drop in pollution levels in the city on Wednesday.

According to an IIT-Kanpur study, the sources of PM2.5 and PM10 during the winter months are: secondary particles like nitrates (25-30 per cent), vehicles (20-25 per cent), biomass burning (17-26 per cent), municipal solid waste burning (9-8 per cent) and to a lesser extent soil and road dust. The air quality of Delhi improved by nearly 100 units with AQI 282 on Wednesday as compared to pollution levels on Tuesday when AQI was 378.


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