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Perfect Pollucon Services

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Sources of Air Pollutants
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Sources of Air Pollutants

Measurement of air pollutants is major step towards controlling them. Sources of Air pollutants can be natural or may be the results of activities of human like vehicles etc. Also air pollutants can be categorised as primary of secondary pollutants. In based on sources of air pollutants they can be differentiated like stationary or mobile sources.

Government has notified to all industries their emission limits and every manufacturing industry has to obey those rules so that we all can contribute to reduce pollution, also they notify us air pollution levels for every city in simple numbers through media like newspapers, televisions and radio etc. it is called as air quality index.

Read more why there is need to calculate air quality index?

Classification and Sources of Air Pollutants

Air pollutants can be classified as follow:

Natural Pollutants

There are several natural pollutant pollute air such as Natural fog, particles of volcanic eruption, Pollen grains, bacteria etc. amongst of them pollen grains are very important because their size range can vary from 5 µ to 100 µ (Micron). Larger particles can cause bronchitis, asthma, dermatitis to human beings.

 

Aerosols

Aerosols can be defined as solids or liquids are present in microscopic size in air. It can be dust, smoke, mists, fog and fumes. Sometimes they are called as Particulate matters it can be measured by using high volume air sampler. .

Dust

Dust is made up of Solid particles generated by crushing, grinding processes. Its range can vary from 0.01 µ to 100 µ (Micron). Mostly 5 µ or smaller particles tend to form stable suspension in air. It is called as particulate matter.

Learn More About Particulate Matter PM10 and PM2.5

Smoke

Smoke can be defied as particles produced by incomplete combustion of fuel. Generally size of the particles is less than 1 µ.

Mists

Mist can be defined as liquid particles are present in air in very low quantity. This means light dispersion of water droplets suspended in atmosphere.

Fogfog

Fog is defined as visible aerosols present in air in liquid phase. Formation of fog is mostly because of condensation of water vapour. It can reduce visibility to less than 1/2 km. In Fog particle range can be vary from 40-1.0 µ

Fumes

These are solid particles produced by condensation from the gaseous state. Generally volatilization from melted substances. Fumes flocculate and sometimes coalesce.

 Gases

The various Gases and their vapours which are major contributor to air pollution.

Read More About

Sulphur Compounds

Sulphur Dioxide

This is one of the Primary pollutant of air pollutants. The main source of sulphur dioxide is combustion of fuels, especially coal. The sulphur content may vary from 1 % (good quality coal) to 4 % (bituminous coal). Another source of Sulphur is metallurgical operations. During smelting of ores of zinc, copper and lead produce sulphur dioxides.Sources of air pollutants

 

Majorly SO2 is emitted from process stacks, DG set,  boiler stack, scrubber stack etc.

 

Hydrogen Sulphide

This gas is foul smelling smell. The sources of this gas is majorly from anaerobic biological decay processes on land, in swamps and in oceans. Volcanos and Natural water springs emit hydrogen sulphide to some extent. Also Kraft pulp and Petroleum Refinary industry emit hydrogen sulphide to major extent.

Hydrogen Fluoride

Major Sources for hydrogen fluoride are manufacturers of phosphatic fertilizers, brick plants, pottery, aluminium industry and ferro-enamalworks. Hydrogen fluoride is very important air pollutant even if it is present in very low concentrations. And it can harm humans and animals at such low levels.

Chlorine and Hydrogen Chloride

Chlorine is found in polluted air as chlorine as hydrogen chloride, Chlorine containing organic compounds. Major Sources of Air Pollutants as chlorine and its compounds are chemical industries, water purification process, sewage plants, swimming pools etc. It can cause respiratory track irritation in human.

Oxides of Nitrogen

It is apparent that oxides of Nitrogen are the second highest contaminant in major cities. Mostly oxides of nitrogen are present due to emission from industries where nitric acid is produced or used. Next Sources of Air Pollutants as Oxides of nitrogen are Automobile exhausts, power plants and low heat burners and furnaces etc. out of all nitrogen oxides only nitric oxide and nitrogen dioxide arise from human activities. Normally it is written like NOx to show all oxides of nitrogen.air pollution due to automobile

Carbon Monoxide

This is odourless and colourless gas produced by incomplete combustion of carbonaceous materials. It is highly poisonous gas. Major source of Carbon Monoxide is incomplete combustion of Fuel from automobiles engines. Also furnaces, petroleum refining operations, gas manufacturing plants etc. emit carbon monoxide.

Ozone

Origin of ozone in air has not been clarified but it is likely that sunlight and combustion are evolved in ozone’s production. Ozone is poisonous and smelly. It exists in upper layer of atmosphere.

Aldehydes

These are produced by combustion of Diesel, petrol fuel oil, natural gas, and gasoline etc. Incomplete combustion of fuels and lubrication oils cause to the formation of aldehydes. It can cause irritation of eyes.

Organic Vapours

Sources of Air pollutants like organic vapours include large numbers of chemical compounds, like aromatic hydrocarbons, acetylene, olefins and chlorinated hydrocarbons. It can be produced in combustion processes. Also they are majorly responsible for smog.

Radioactive Gases

A Major source of radioactive gases are nuclear power reactor. Also testing for atomic bombs, agricultural, industrial and medically use of radioactive isotopes etc.

Summarizing, major sources of air pollutants are mobile sources (Vehicles), stationary sources (Power plants, industries etc.), area sources (Agriculture, Cities etc.)

Read more Environmental Monitoring

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Sources of Air Pollutants