INTRODUCTION AND OBJECTIVES OF AIR QUALITY CONTROL

INTRODUCTION OF AIR POLLUTION CONTROL 

Air pollution control s defined as the measures taken to achieve the certain standards of emissions.

When the standards are met, it is said that pollution is in control. The measures taken are as follows:

• change in processes
• change in raw materials
• modification of equipment
• installation of treatment device at the end of processing equipment

The devices that control the air pollution are called as air pollution control devices. 

The control is related with another term known as abatement. 

While the control is just referred to the meeting of certain standards of emissions but control is defined as:

The measures taken to reduce the amount of emissions regardless the standards. 

When the measures of abatement meets the standards of emissions than abatement becomes control.

There are two types of air pollution control depending upon the types of air pollution.

• Particulate Control
• Control of gaseous pollutants

AIR QUALITY CONTROL

The main objective of air pollution control is to maintain such an atmosphere that has no negative influence on the human activities. The best solution to control the pollution is simply by not producing the pollutants. For Example by burning non leaded fuels instead of leaded fuels eliminates the lead emissions. Similarly nitrogen oxide emissions are reduced by redesigning the engines.

A substitute of nitrogen oxides pollution is to shift the location of nitrogen oxides sources from automobiles tailpipe to stack of electric generating station by utilizing hydrogen fuel cars. 

By legislating the amount of of ash and sulphur in fuels emissions can also be reduced of materials and its end products. 

Pollution can also be reduced by using add on devices. In vehicles carbon canisters are used to absorb the hydrocarbons vapors from carburetor and gas tanks. In automobile exhaust catalytic converters are utilized. for reducing the hydrocarbons emissions.the energy in hydrocarbons is released as heat. 

In industrial applications scrubbers are used to to remove pollutants from stack or gas streams. The scrubbers enforce the pollutants to chemically react with the materials to form stable compounds for collection and storage.

Planned dispersion may also provide a solution for the local air quality where other techniques cannot control the pollution. Tall stacks require the long time fort he pollutants to reach on the earth surface to make harm to the humans. materials and vegetation. For Example electric heating shifts the emissions from short chimneys in houses to tall stacks in remote areas.