vk18 on Instagram: "Delhi's air quality nears 'severe' level, pollution crosses 400-mark in 15 stations The 24-hour average Air Quality Index (AQl) reported at 4 pm everv dav, stood at 361 on Saturday. It worsened further to 372 at 6 pm. Delhi's air quality worsened on Saturdav as pollution levels exceeded the 400-mark in manv areas, making the national capital one of the most polluted cities in the country"