Medicine

Delhi air quality worsens, back to hazardous quality

Delhi air quality worsens, back to hazardous quality

The concentration of PM1 (smaller than one micrometre and the most unsafe pollutant) was 45 microgram per cubic metre (µg/m3) in Mumbai in December 2016, against 42µg/m3 in Delhi, found the System of Air Quality Weather Forecasting and Research (SAFAR). Some of the Sri Lankan players had fallen sick.

The rise in pollution levels have been attributed to low minimum temperatures and high moisture levels that create ideal conditions for the creation of smog as particulate matter get trapped close to the surface. The corresponding prescribed standards are 60 and 100.

On November 14, Lucknow had earned the dubious distinction of being the most polluted city in the country with AQI of 484. Four UP cities figured in the "very poor" air quality category of CPCB on Wednesday.

Yesterday's 24-hour average was 351.

After a week of "moderate" air quality, the pollutant measuring indicator - air quality index (AQI) - fell to 43. The rest was in the "very poor" zone.

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An AQI level between 0-50 is good, 51-100 is satisfactory, 101-200 is moderate, 201-300 is poor.

However, thanks to government efforts, the level of dust in Lucknow's air was slowly coming down but the recent increase in humidity led to a steep rise in air pollution on Wednesday.

November witnesses extremely high levels of pollution as smoke from paddy residue burning reaches the city, aggravating the situation.

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.

Air Quality Index has turned worse in many parts of Delhi with the readings in Anand Vihar turning severe.


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