Ozone Pollution Across Urban India
Context: A recently released report from the Centre for Science and Environment (CSE) has highlighted a troubling increase in ground-level ozone pollution across urban India. More on the News: The report titled Air Quality Tracker: An Invisible Threat reveals that cities like Delhi-NCR are experiencing alarming levels of ozone exceedances, posing significant health risks to residents. The researchers analyzed trends from April 1 to July 18 for the years 2020 to 2024, using granular, real-time data (15-minute averages) from the Central Pollution Control Board. Key Highlights: Ozone Pollution Trends in Major Cities: The researchers analysed metropolitan areas of Bengaluru, Chennai, Kolkata, Mumbai and Pune. They also looked at the data for Delhi, Ahmedabad, Hyderabad, Jaipur and Lucknow. The study indicate that all cities monitored exceeded national ozone standards, with Delhi-NCR recording the highest number of exceedance days—176. Other cities like Mumbai and Pune followed closely with 138 days, while Chennai had the fewest at just nine days. Notably, ozone levels were elevated even during nighttime, particularly in Mumbai, raising concerns about prolonged exposure to this harmful pollutant.
