Visibility in parts of the city dropped to 200 metres, said R K Jenamani, senior scientist at India Meteorological Department (IMD). The air quality index (AQI) in Delhi shot up to 451 (severe) at 8 am as low temperature and fog in the morning allowed the accumulation of pollutants.įog conditions intensified in Delhi-NCR on Friday morning lowering visibility at the Indira Gandhi International Airport and the Safdarjung Airport to the range of 200 to 500 metres at 5:30 am.

The PM10 levels crossed the 500 micrograms per cubic metre mark around 5 am on Friday and stood at 511 micrograms per cubic metre at 9 am.Īccording to the Graded Response Action Plan (GRAP), the air quality is considered to be in the emergency category if PM2.5 and PM10 levels continue to be above 300 micrograms per cubic metre and 500 micrograms per cubic metre, respectively, for 48 hours or more. According to the Central Pollution Control Board (CPCB), the 24-hour average concentration of lung-damaging fine particles known as PM2.5 in Delhi-NCR shot up from 243 micrograms per cubic metre at 6 pm on Thursday (Diwali day) to 410 micrograms per cubic metre at 9 am on Friday, around seven times the safe limit of 60 micrograms per cubic metre.

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