LONDON -- As the celebrations of the Diwali festival come to an end, the city of New Delhi faces air quality in the "very poor" category, as per India’s National Air Quality data. In the AQI bulletin released on Tuesday, the average AQI was 351, about seven times higher than the "good" limits, which max out at a score of 50. The average inched up to 353 on Wednesday. The major pollutants are the particulate matter called PM2.5. On the night of the festival, on Monday, Delhi's pollution data showed the PM2.5 number rose to 994 at midnight, against the quality limit of 0-60. And, on Tuesday, the number again went up to 853 at 9 p.m. local time. These small particles can penetrate deep into the lungs and can be a cause of conditions such as asthma and bronchitis, according to health officials

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