Across cities, official Air Quality Index (AQI) readings often overlook local hotspots. Chennai has eight Continuous Ambient Air Quality Monitoring Stations (CAAQMS) that function 24/7 throughout the year. But this isn’t enough to map particulate matter. Air changes every few metres, as researchers from the Indian Institute of Technology-Madras tell us. Seasonal variation, construction, vehicular movement, and proximity to industries also change the air we breathe, In 2022, over 17 lakh people died in India due to air pollution (PM 2.5), according to a Lancet study. With better hyper-local air data and public awareness, citizens and policymakers can target pollution…

​“What happens when we remove this natural infrastructure of the city? What happens if it floods? What happens if the air quality (index) goes really high?” asks Pooja Domadia, a member of the Save Mumbai Mangroves campaign. These are questions that many Mumbaikars have as work begins on the Versova-Bhayandar Coastal Road, which is set to affect 45,000 mangrove trees. In March this year, the Supreme Court dismissed a petition challenging the Bombay High Court order to greenlight the cutting of mangroves for the project. Is the SC decision a fatal blow to the movement? The BMC has already begun…