Question

In the above given picture, what are the air pollutants released by “STATIONARY” group of objects

A. Carbon dioxide
B. Methane
C. Fluorinated gases
D. All of the above

Answer 1

Air pollutant emissions sources can be classified into two categories- stationary and mobile sources. Stationary sources of emission are usually fixed in one place. Households, industries, refineries, power plants and boilers are some of the examples of stationary emission sources. They emit a variety of harmful air pollutants into the atmosphere.

Complete step by step answer:
Option A carbon dioxide: Carbon dioxide $\left( {C{O_2}} \right)$ traps earth’s heat radiation and helps keep the earth warm. This is called the greenhouse effect. However increased level of $C{O_2}$ in the air can lead to global warming. Some of the stationary sources that release $C{O_2}$ as a pollutant are coal, petroleum burning industries, chimneys, automobiles, iron and steel industries etc.
Option A is correct.
Option B methane: Methane is one of the major air pollutants that cause increased greenhouse effect and global heating. Methane is released into the environment by manmade activities as well as naturally. Stationary sources that emit methane as a pollutant are coal mines, biofuel production units, waste water treatment plants, oil wells etc.
Option B is also correct.
Option C fluorinated gases: There are three main fluorinated gases emitted as pollutants- hydrofluorocarbons, perfluorocarbons and sulphur hexafluoride. They are released mainly by household and industrial sectors. Fluorinated gases have no natural sources of emission.
Option C is also correct.
Option D all of the above: Since all of the given options are correct, option D is the correct answer

So, the correct answer is “Option D”.

Note: Some of the control measures for air pollution include treating the pollutants at industry itself to reduce its effects. Substituting fuels such as petroleum, gas and oil with compressed natural gas (CNG). Modify and maintain existing pieces of equipment at industries to minimize the emission of air pollutants; and last but the most important measure is to plant many trees.