While the AQI remained in the 'moderate' category, it worsened from the 152 recorded on Sunday morning

After holding steady for three days, the air quality began to decline on Friday

Winter brings calm and slow-moving winds, reducing the dispersion of pollutants. As a result, contaminants remain trapped near the ground, leading to higher AQI levels. Additionally, the use of biomass for heating purposes during colder months contributes significantly to air pollution, further worsening the air quality

Meanwhile, IMD has predicted partly cloudy sky on Sunday evening in city and suburbs

The Maharashtra Pollution Control Board (MPCB) issued notices to both the BMC and MMRDA for violating guidelines, and served a separate notice to the Indian Institute of Tropical Meteorology (IITM) regarding the recalibration of its Colaba station