[PDF] Nitrogen Oxides (NOx) Why and How They are Controlled

What is pollutant?

(1) Pollutant means a substance, vibration, heat, noise, light or other contaminant present in air, water or land which may be harmful to human health or the environment.

What are the types of pollution?

Pollution can be of many types like noise pollution, air pollution, soil pollution, water pollution, etc. Air pollution is increasing day by day because of the growing number of automobiles, release of poisonous gases, smoke from industrial companies, finely dissolved solids, liquid aerosols, etc in the atmosphere.

How does water become polluted?

Water becomes polluted when foreign substances enter the environment and are transported into the water cycle. These substances, known as pollutants, contaminate the water and are sometimes harmful to people and the environment. Therefore, water pollution is any change in water that is harmful to living organisms.

What is point source pollution?

Point source pollution occurs when a pollutant is discharged at a specific source. In other words, the source of the pollutant can be easily identified. Examples of point-source pollution include a leaking pipe or a holding tank with a hole in it, polluted water leaving a factory, or garbage being dumped into a river.