NEW DELHI: The air quality in Delhi sharply deteriorated to the ‘severe’ category on Saturday as a toxic greyish haze blanketed the city. The 24-hour average overall AQI released at 4pm was 431, as opposed to 349 a day earlier. However, the AQI subsequently slipped into the ‘severe plus’ category for the first time this year, reaching 452 at 8pm. This prompted CAQM to impose stringent measures under GRAP, first under stage 3 and then stage 4 as the air worsened, on the same day. No respite from hazardous air quality is expected on Sunday. Experts said the AQI spiked due to high emission loads and unfavourable meteorological conditions. The farm fire season is over, while an increase in moisture due to the formation of fog, calm winds, and inversion trapped the pollutants. Among the me

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