The Bhopal gas tragedy occured on the night of December 2-3, 1984 at the Union carbide India Limited pesticide plant in Bhopal.
A leak of methyl isocyanate gas caused the tragedy.
Nitrous oxide is commonly known as laughing gas.
It is also a major greenhouse gas and air pollutant along with CO 2 with tremendous global warming potential.
Asthma is an allergic disorder in which wheezing sound is produced due to inflammation of bronchioles.
Bioreactor are required for growing microbes on a large scale production of enzymes.
The Montreal Protocol (an international treaty in Canada, 1987) was signed to control the emission of ozone depleting substances into the atmosphere.
Polyblend is a fine powder of recycled modified plastic.
Polyblend is mixed with the bitumen and is used to lay roads.
Blend of Polyblend and bitumen enhances the bitumen's water repellant properties and helps to increase road life.
The gases that cause the greenhouse effect are : 1.
Carbon dioxide (60% effect) 2.
Vapour 3.
Methane (20% effect) 4.
Nitrogen oxide (6% effect) 5.
Ozone 6.
Chlorofluorocarbons (14% effect) Thus, carbon dioxide and methane are the major greenhouse gases.
World Ozone day is celebrated on 16 th September.
A primary pollutant is an air pollutant emitted directly from a source.
A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.
O 3 (ozone) is a secondary pollutant.
UV rays act on chlorofluorocarbons (CFCs) releasing active chlorine (Cl, ClO) which further reacts with ozone in sequential manner thereby converting it into oxygen.
