Explanation –
Particulate matter smaller than 2.5 microns (PM2.5) is one of the most hazardous components of air pollution, responsible for serious respiratory and cardiovascular diseases. Traditionally, primary pollutants such as soot and dust from burning fossil fuels have been considered the chief contributors to PM2.5 levels. However, new research highlights the rising significance of secondary pollutants, especially ammonium sulphate, as key components of India’s air pollution challenge. Primary and Secondary Pollutants: A Distinction - Primary pollutants originate directly from emission sources such as vehicle exhaust, coal-fired power plants, and biomass burning. In contrast, secondary pollutants are formed when primary pollutants react with each other or with atmospheric elements like water vapour and sunlight. These reactions lead to the formation of complex particles like ammonium sulphate and ammonium nitrate, which can be equally or more harmful.
Explanation –
Particulate matter smaller than 2.5 microns (PM2.5) is one of the most hazardous components of air pollution, responsible for serious respiratory and cardiovascular diseases. Traditionally, primary pollutants such as soot and dust from burning fossil fuels have been considered the chief contributors to PM2.5 levels. However, new research highlights the rising significance of secondary pollutants, especially ammonium sulphate, as key components of India’s air pollution challenge. Primary and Secondary Pollutants: A Distinction - Primary pollutants originate directly from emission sources such as vehicle exhaust, coal-fired power plants, and biomass burning. In contrast, secondary pollutants are formed when primary pollutants react with each other or with atmospheric elements like water vapour and sunlight. These reactions lead to the formation of complex particles like ammonium sulphate and ammonium nitrate, which can be equally or more harmful.