New Delhi, A decade-long analysis of air quality data shows that pollutants in Indian cities, including the national capital, follow sharply different seasonal patterns, underscoring the need to study each pollutant separately rather than relying on broad air quality trends. Study of seasonal pollutant trends key to tackling air pollution: Data A new public dashboard developed by research and advisory think tank Envirocatalysts compiles daily air quality records from the Central Pollution Control Board since 2015, enabling users to track long-term trends across pollutants such as particulate matter , nitrogen dioxide , carbon monoxide and ozone “To truly curb air pollution, we must track multiple pollutants across diverse timelines. The variations of each pollutant are the fingerprints that expose underlying sources and factors, allowing us to move beyond broad data toward targeted action,” said Sunil Dahiya, founder and lead analyst of Envirocatalysts, explaining that understanding the complicated seasonal patterns of each pollutant is necessary to study air pollution overall. For example, a detailed analysis of the PM2.5 levels in Delhi from 2015 onwards shows a …