Delhi air pollution: AQI turns 'severe'; schools shut, curbs imposed
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Delhiites woke up to a smoggy Friday morning as the city's Air Quality Index (AQI) dropped to 460 at 7:00am, the worst so far this year. Delhi's AQI was recorded at 422 at 10:00pm on Thursday. The AQI has been gradually worsening over the last few days. Any AQI over 400 is considered in the "severe" category. On Thursday, an air emergency was declared in the national capital as its air quality index plummeted.