Tag: environment and conservation

Carbon dioxide is described as pollutant or not a pollutant depending on the source of emission. The carbon dioxide which is released from the plants and animals as the end product of the respiration is not considered as a pollutant. The carbon dioxide gas which is released as the exhausts and emissions from the industries causes pollution and are referred as a pollutant. The main role of the gas is in increasing the temperature of Earth and so these are not pollutants. 

The full form of PAN is Peroxyacetyl nitrate. It is a major pollutant of smog which has adverse effects on eyes and lungs. Therefore the correct answer is B.

CO reacts with haemoglobin much faster than oxygen. It can be fatal to life. If the amount of CO is high, it forms carboxy haemoglobin on combination with haemoglobin which causes suffocation even leads to death in fetal condition. Thus, the correct answer is option D.

According to the WHO, the most polluted city in the world in 2016 is Zabol in Iran with particulate matter concentration of 2.5. This is more than 20 times higher than the WHO's guidelines. Thus the correct answer is option A.

Particulate pollutants are the mixture of small solid particles and liquid droplets. It consists solid particles like soot, flash, dust of various types, fir, hair, spore etc. It is classified as the suspended particulate matter which is the source of pollution and may adversely affect the environment. It can cause harmful effects on health on inhaling it.

Hydrocarbons are nonbiodegradable pollutants. They are a type of secondary pollutants. They are very dangerous for life. Hydrocarbons are produced naturally as well as due to incomplete combustion of the fuels. They are the major cause of respiratory disorders. Man used fuel for their own purpose with releases harmful gasses and causes pollution.

The atmosphere comprises of layers based on temperature. Each layer has a specific composition of gases. These layers are the troposphere, the stratosphere, mesosphere and thermosphere. All these layers are placed to a different level from the earth. 

The presence of CFCs in the atmosphere results in the depletion of the ozone layer. They are used as coolants in refrigerators, aerosol sprays, coolers, etc. The increase in the concentration of the chloro- fluoro-hydrocarbon molecules in the atmosphere results in air pollution.