Air is the invisible mixture of gases that surrounds Earth. Air contains important substances, such as oxygen and nitrogen, that most species, including human beings (Homo sapiens), need to survive. Air pollution is the contamination of the indoor or outdoor environment by any chemical, physical or biological agent that modifies the natural characteristics of the atmosphere – (WHO).

The degree to which the air in a particular place is pollution-free is called Air quality. Air quality refers to the degree to which the air is suitable or clean enough for humans or the environment. Good air quality means the air is free of harmful substances.

Various studies and WHO data show that almost all of the global population (99%) breathe air that exceeds WHO guideline limits and contains high levels of pollutants, with low- and middle-income countries suffering from the highest exposures.

Deteriorating Air Quality is a topic of big concern and has derived the attention of global leaders and corporates.

Air pollution is the second leading cause of noncommunicable diseases, such as asthma, stroke, pulmonary illnesses, cancer, and heart disease, which are on the rise worldwide. In many countries, such diseases can only be significantly reduced by improving air quality.

Major contributors to Air pollution are:

• Moving Vehicles (PM2.5, CO, NOx, SO2, HC and NH3).

• Toxic gases from Industries (Smoke and Smog)

• Power Plants and Infra development.

• Indoor Household combustion.