Natural Resources — Science STD 9 — Question

The introduction of chemicals, particulate matter, or biological materials into the atmosphere that cause harm or irritate living organisms or damage the natural environment is known as air pollution.

The major causes of air pollution can be in the form of solid particles, liquid droplets, or gas. There are many different chemical substances that contribute to air pollution. These chemicals come from a variety of sources. Among the many types of air pollutants are nitrogen oxides, carbon monoxides, and organic compounds that can evaporate and enter the atmosphere.

Air pollutants have sources that are both natural and human. Humans contribute substantially more to the air pollution problem. Forest fires, volcanic eruptions, wind erosion, pollen dispersal, evaporation of organic compounds, and natural radioactivity are all among the natural causes of air pollution. Though some pollution comes from these natural sources, most pollution is the result of human activity. The biggest causes are the operation of fossil fuel-burning, power plants and automobiles that combust fuel.

Effects of air pollution on human beings:

1. SPM (suspeneded particulate matter) causes asthma, bronchitis and allergic cold.
2. Pollutant gases cause irritation in eyes, throat and lungs. Heart related diseases tend to increase.
3. Hydrocarbon vapours not only damage the internal organs but also cause cancer.