CNG and Pollution
Published: May 31, 2013
Photo: Prasad
Abstract: With 1.1 million vehicles running on compressed natural gas (CNG), India has the 5th largest fleet of CNG vehicles in the world. However, CNG use only manages to reduce the particulate matter (PM) emissions as compared to other conventional fuels—on other counts however it performs poorly. Combined with the inability of the massive population of two-stroke auto rickshaw engines to adequately burn CNG, beseeches the government to re-evaluate their transport pollution control strategy.
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What is ...
These are minute solid or liquid particles suspended in the air. Aerosols interact directly and indirectly with the earth’s heat budget and scatter sunlight, causing haze.
These pollutants are emitted directly into the air from their source, in their present form. Sulphur dioxide, carbon monoxide and nitrogen oxides are all primary pollutants. Primary air pollutants chemically react to form secondary air pollutants.
Occurs due to concentration of sulphur dioxide and nitrogen dioxide in the atmosphere, which react with water molecules in the atmosphere too produce acids which fall to the earth as acid rain.
Are also called halocarbons which are nontoxic nonflammable chemicals used in refrigerants, propellants and solvents. Though stable when released they break apart and release chlorine atoms in the stratosphere destroying the ozone layer.
A term given to clouds formed over developing nations which appear brown due to scattering of aerosols and other pollutants, predominant in Asian countries.
Which are found in higher concentration in indoor environments are emitted gasses from certain solids or liquids and have long term health effects.
Is a type of suspended particulate matter which is smaller than 2.5 micrometers in diameter and penetrates the lungs causing health problems.
Is a gas predominantly forming the ozone layer which protects the earths surface from harmful ultraviolet rays in the stratosphere. In the troposphere it is a pollutant and acts as a green house gas causing photochemical smog.