A layer of smog shrouded Delhi-NCR on Thursday and partially blotted out the sun on Chhath Puja as the air quality slipped back into the severe zone with unfavourable meteorological conditions aiding accumulation of pollutants, authorities said.Green think tank Centre for Science and Environment (CSE) said the ongoing smog episode is a public health emergency.
“This requires urgent emergency action on key combustion sources (vehicles, industry, waste burning) and dust sources (construction and roads) to prevent further trapping of pollution when there is no wind to blow this away,” said Anumita Roychowdhury, executive director, research and advocacy, CSE.The 24-hour average AQI was 372 on Wednesday.Ghaziabad (454), Greater Noida (404) and Noida (426) also recorded severe air quality at 10 a.m.An AQI between zero and 50 is considered “good”, 51 and 100 “satisfactory”, 101 and 200 “moderate”, 201 and 300 “poor”, 301 and 400 “very poor”, and 401 and 500 “severe”.
An official from the India Meteorological Department (IMD) said shallow fog and low temperatures in the morning – Delhi recorded the season’s lowest temperature of 12.6°C on Thursday – trapped pollutants close to the ground and calm winds led to stagnant conditions.
