Mumbai’s AQI is in the news due to its recent reading. According to the article, the city’s AQI on Diwali afternoon was 131, which is its lowest in four years. However, the article also notes that the air is still not clean. The article does not provide information on why the AQI is in the news or what specific actions are being taken to address the issue. It only mentions the current AQI reading and its comparison to previous years. The article does not provide any information on the current or ongoing efforts to improve the air quality in Mumbai. The AQI reading of 131 is considered a significant improvement from previous years, but the article does not provide any context on what this reading means in terms of air quality.