Which is not a source of air pollution?

Concept:

• Air pollution is the presence of substances in the atmosphere that are harmful to the health of humans and other living beings or cause damage to the climate or to materials.
• An air pollutant is a substance that contributes to air pollution due to its physical, chemical or biological properties. 
• There are many different types of air pollutants, such as gases, particulates, and biological molecules. 

Explanation:

• Automobiles and Industries emit a large number of pollutants because they run on fossil fuels.
• Dust Particles are also considered air pollutant under the particulate matter.
• Solid waste is not a source of air pollution as long as it does not emit any harmful gases.
• Carbon monoxide, Sulphur dioxide, Nitrogen dioxide, Ozone, and Particulate Matter are the major air pollutants.
• Carbon dioxide is not considered in air quality monitoring measures of various countries.
• Air pollution causes respiratory diseases and skin allergies.
• Sulphur and nitrogen dioxides also lead to acid rain.

Thus,  Solid Waste is not a source of air pollution.