Vehicular emissions, which have doubled since 2016 and became a major contributor to rising air pollution; and localised pollution including garbage burning are causing frequent deterioration of air quality in some parts of the city, even as its overall air quality index saw an improvement to moderate level. 

On Tuesday, the System of Air Quality Weather Forecasting And Research (SAFAR), based on the readings from 10 air air quality monitoring stations in the city, recorded an overall AQI of 197—which falls in the moderate category (101–200). However, of the 10 stations, Andheri recorded an AQI of 228 (poor), while Malad and Mazgaon crossed the 300-mark recording an AQI of 301 and 312, respectively. An AQI between 201 and 300 falls under the poor category and above 300 falls under the very poor category.