Mumbaiites continue to breathe poor air, night temperature remains 4.5 degrees C below normal

The city continued to have poor air for the second day in a row.The pollutant-measuring indicator air quality index (AQI) fell from 224 on Monday morning to 220 by the evening, both falling under the ‘poor’ category. There was no change in minimum temperatures from Sunday, which was 4.5 degrees Celsius below normal.

The System for Air Quality Weather Forecasting and Research (SAFAR) predicted an AQI of 220 for Tuesday as well. An AQI between 101 and 200 falls under the ‘moderate’ category, while that between 201and 300 is ‘poor’ and beyond 301 falls into the ‘very poor’ category.

The Santacruz weather station, representative of Mumbai, recorded the night temperature at 16.4 degrees Celsius, similar to Monday and November 11, which has been the lowest November night temperature since 2012. The night temperature at Colaba, representative of south Mumbai was recorded at 22 degrees Celsius, a degree Celsius below normal.

Officials from the weather bureau said the current wind pattern over the city has led to cool temperatures and a decline in air quality. “From late Saturday night onwards, cool winds from the north-western parts of the country has led to a cooling effect,” said KS Hosalikar, deputy director general, western region, India Meteorological Department. “As a result, due to the process of inversion, cool temperatures have allowed pollutant particles to settle close to the surface. We expect these conditions to continue till Wednesday.”

Meanwhile, day temperatures were more than 2 degrees Celsius above normal as Colaba and Santacruz, both recorded 35.6 degrees Celsius as the maximum temperature. “During the day, the winds are not strong and this has allowed temperatures to rise. However, cool winds during the night are leading to a fall in temperatures,” said Shubhangi Bhute, director, Regional Meteorological Centre, IMD. “The gap between day and night temperatures can lead to health issues such as cough, cold and fever,” Bhute added.

On Monday, Malad was the most polluted location with an AQI of 307 (very poor), followed by Navi Mumbai at 303 (very poor). While majority of the locations in Mumbai recorded ‘poor’ air quality, Borival had the cleanest air with an AQI of 132 (moderate).