 "Delhi air pollution")
After slipping into the 'severe' category on Thursday evening, Delhi's air on Friday morning was 'very poor' with an overall AQI of 329.
The AQI of Delhi was 329 at 8 AM, according to the Ministry of Earth Sciences' air quality forecast agency SAFAR. The neighbouring cities of Noida (351), and Gurugram (324) also reported "very poor" air quality.
Readings below 50 are considered safe, 51 and 100 are "satisfactory" and anything above 300 is considered hazardous or "severe".
On Friday, Delhi was the world's second most polluted city worldwide, with an AQI of 198, according to IQAir. Kolkata was
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