Aerosols cause of decline in India’s monsoon In News Researchers now think aerosols from vehicular exhaust, half-burnt crop residue, dust and chemical effluents may be weakening the life-giving rainy season even more than GHGs. Mix of GHGs, aerosols and changes in forest and agricultural cover are the major causes of decline in monsoon. “An Indian Institute of Tropical Meteorology, Pune, team led by climatologist R. Krishnan studying the likely monsoon impact of GHGs over the next century has come to this conclusion” How aerosols weakens monsoon? Dust clouds shield the earth from the sun’s rays, which reduces land and sea temperatures and thereby reducing the variation between the two. A good monsoon is produced by the difference in temperature between land and sea, is thus weakened by aerosol accumulation. Aerosol An aerosol is a colloid of fine solid particles or liquid droplets, in air or another gas Aerosols can be natural or anthropogenic. Examples of natural aerosols are fog, forest exudates and geyser steam. Examples of artificial aerosols are haze, dust, particulate air pollutants and smoke. GHGs GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in Earth’s atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone.