Question

Atmospheric pollutants formed by human activities constitute of the total of
A)95%
B)75%
C)25%
D)0.05%

Answer 1

Air pollution kills an estimated seven million people worldwide each year. The combined effects of ambient (outdoor) and household pollution cause about seven million premature deaths per annum, largely as a result of increased mortality from stroke, heart condition, chronic obstructive pulmonary disease, carcinoma and acute respiratory infections.

Complete answer:
Air pollution releases into the atmosphere of varied gases, finely divided solids, or liquid aerosols. These substances may reach concentrations within the air that cause undesirable health, economic, or aesthetic effects. Human activity is to blame for most of the world’s pollution, both indoors and outdoors.

Man is a minimum of partially guilty for many of the world’s major air pollutants. CO2 is one in every of the foremost highly prevalent, comes from the combustion or burning of fossil fuels and other organic materials. Pollutant and dioxide, while both natural components of the Earth's atmosphere, occur in greater amounts because of human actions and are the explanation for smog and acid precipitation.

Pollutants also include CFCs, were widely used as refrigerants and aerosol propellants. These chemicals damage the ozonosphere. Particulates, microscopic particles of soot, smoke from burning coal, fuel is also a major source of particulate emissions. Additionally to being harmful to breathe, particulates form a dark film on buildings and other structures.

Causes of air pollutants: The burning of fossil fuels like coal and gasoline is the single largest source of air pollutants. Fossil fuels are still in wide use for heating, to control transportation vehicles, in generating electricity, and in manufacturing and other industrial processes. Burning these fuels causes smog, air pollution and gas emissions. Burning fuels also increases some heavy metal contaminants and therefore the amount of soot within the air. Power plants and factories emit sulfuric air pollutants.

Pollution effects: Smog is one in every of the foremost dangerous air pollutants to humans and other biological organisms. It's made when coal and oil containing minor amounts of sulfur are burned. The oxides of those sulfur particles form oil of vitriol, which is toxic to life and damaging to several inorganic materials. Pollution can damage human life, especially in major cities where there's a conglomerate of industries and fumes from vehicles.

Pollution harms the living environment, sulphur dioxide, nitrogen oxides and peroxyacyl nitrates enter leaf pores and damage plants that way. Pollutants also cut loose the waxy coating of leaves that prevent excessive water loss, causing further damage to crops and trees that are important to the encompassing environment.

Hence, the correct answer is option (D)

Note: Air pollutants are gases and particles which lead to harm people or other life, damage materials or reduce visibility. There are various air pollution from volcanic eruptions, forest fires, and hot springs, but most is the result of human activities. Power plants, factories, vehicles emit carbon dioxide, carbon monoxide, hydrocarbons, sulfur dioxide, nitrogen oxides and particulate matter which consists of fine particles suspended in the air. Burning oil, coal, gasoline and other fossil fuels is a major cause of man-made air pollution.