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As Air Quality Continues To Deteriorate, Delhi Government Issues Health Advisory, Again

Air quality in Delhi remained ‘very poor’ for the fourth day. According to SAFAR, an agency under the Ministry of Earth Sciences, PM2.5 and PM10 levels will rise further over the next three days

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Highlights
  • Delhi government issued a health advisory urging people to avoid going out
  • If needed, will take harsh measures to prevent repetition of smog: Centre
  • PM2.5 and PM10 levels will rise further over the next three days: SAFAR

New Delhi: Air quality in Delhi, which remained ‘very poor’ for the fourth straight day on November 27, is set to nosedive further, leading to the Delhi government advising people to stay indoors as much as possible. High moisture content and lack of winds have triggered the spike, the city government said. The Centre said it will take “harsh measures”, if needed, to prevent any repeat of the recent smog episode.

The Central Pollution Control Board (CPCB) registered the day’s air quality index (AQI) at 362, 10 units more than yesterday (November 26), on a scale of 500. The AQI takes into account levels of suspended particulate matter and gases like nitrogen dioxide. An AQI between 301-400 is classified as ‘very poor’, which can trigger respiratory illness on prolonged exposure.

The 24-hour average concentration (rolling) of PM2.5 and PM10 were 291 and 171 microgrammes per cubic metre (ug/m3) respectively at 8pm, multiple times above the prescribed standards 60 and 100, as per readings of SAFAR (System of Air Quality and Weather Forecasting And Research).

During the day, levels of these ultrafine particulates were even higher. CPCB monitors, essentially 17 of its stations located across the city, recorded the maximum levels of PM2.5 and PM10 at 224 and 353 ug/m3.

Emergency measures will kick in if PM2.5 and PM10 concentration cross 300 and 500 ug/m3 and stay there for 48 hours at a stretch.

According to SAFAR, an agency under the Ministry of Earth Sciences, PM2.5 and PM10 levels will rise further over the next three days.

CPCB’s air lab Chief Dipankar Saha said winter is not taking root in the city due to fluctuating wind directions, northwest and west. Mr Saha said wind direction from the north will soon stabilise and surface winds will gain momentum, leading to dispersion of pollutants.

However, pollution will not turn ‘severe plus’, like it had on November 8 and persisted for nearly a week, Mr Saha said.

The city government issued a health advisory urging people to avoid smoking and stepping out during the early morning and late evening hours. It also appealed the city residents to carpool and use public transport, and not to burn dry leaves, crop residue, wood, coal, etc. The government asked schools to avoid outdoor assemblies, sports and other physical activities in the early morning hours.

Union environment secretary CK Mishra said:

As government, we are determined to not let this (smog episode) happen again, which may mean taking harsh measures, and there will be (such measures). Because, we care for lives and we cannot ignore that aspect.

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