Why in news?
Though the aerosol burden over north India is three times more than the global mean value and has been increasing at about 3% per year for the past few decades, the amount of dust aerosol during the pre-monsoon period has decreased by 10-20% during the period 2000 to 2015.
FACTS FOR PRELIMS
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, dust, forest exudates and geyser steam.
Aura is a multi-national NASA scientific research satellite in orbit around the Earth, studying the Earth’s ozone layer, air quality and climate. It is the third major component of the Earth Observing System following on Terra and Aqua.
AERONET (AErosolROboticNETwork) is a network of ground-based sun photometers which measure atmospheric aerosol properties.
OZONE MONITORING INSTRUMENT
The OMI instrument can distinguish between aerosol types, such as smoke, dust, and sulfates, and measures cloud pressure and coverage, which provides data to derive tropospheric ozone.
SOURCE – THE HINDU.