Examples of point sources include sewage treatment plants; oil refineries; paper and pulp mills; chemical, automobile, and electronics manufacturers; and factories. Regulated pollutants from point sources include wastes, soils, rocks, chemicals, bacteria, suspended solids, heavy metals, pesticides, and more.

mobile sources – such as cars, buses, planes, trucks, and trains. stationary sources – such as power plants, oil refineries, industrial facilities, and factories. area sources – such as agricultural areas, cities, and wood burning fireplaces. natural sources – such as wind-blown dust, wildfires, and volcanoes.

The United States Environmental Protection Agency (EPA) defines point source pollution as any contaminant that enters the environment from an easily identified and confined place. Nonpoint-source pollution is the opposite of point-source pollution, with pollutants released in a wide area.

These six pollutants are carbon monoxide, lead, nitrogen oxides, ground-level ozone, particle pollution (often referred to as particulate matter), and sulfur oxides.

Examples of chemical contaminants include nitrogen, bleach, salts, pesticides, metals, toxins produced by bacteria, and human or animal drugs. Biological contaminants are organisms in water. They are also referred to as microbes or microbiological contaminants.

Criteria Air PollutantsThese pollutants are particulate matter, photochemical oxidants (including ozone), carbon monoxide, sulfur oxides, nitrogen oxides and lead.

Six Most Common Air Pollutants

• Carbon Monoxide.
• Nitrogen Dioxide (EPA)
• Ozone (EPA)
• Particulate Matter.
• Lead (EPA)
• Sulfur Dioxide.
• Six Common Pollutants (EPA)

Different types of pollutants include:

• Nitrogen oxides (NOx)
• Sulfur oxides (SOx)
• Particulate matter (PM)
• Ground level ozone (O3)
• Volatile organic compounds (VOCs)
• Mercury (Hg)
• Peroxyacyl nitrates (PANs)
• and more.

The top three biggest polluters, according to the study:

• Transportation, especially cars and planes.
• Food production, meat and dairy in particular–was another.
• Energy production for heating, cooling and running household appliances.

Some of the natural sources of air pollution are organic compounds from plants, sea salt, suspended soils and dusts (e.g. from the Sahara). Other natural sources are released during catastrophes such as volcanic eruptions and forest fires.

Air pollution can damage crops and trees in a variety of ways. Ground-level ozone can lead to reductions in agricultural crop and commercial forest yields, reduced growth and survivability of tree seedlings, and increased plant susceptibility to disease, pests and other environmental stresses (such as harsh weather).

Water gets contaminated by the following ways: (i) Many industries discharge harmful chemicals to rivers and streams. (ii) Water gets contaminated when sewage is disposed off in rivers. (iii) Pesticides, weedecides and other chemicals also dissolve in water and get contaminated.

How to reduce air pollution?

1. Plant more trees and nurture the ones present.
2. Minimize Pollution from Cars by using Electric Vehicles, Carpooling, Keeping Car well serviced.
3. Using environment friendly vehicles like bicycle to cover short distances.
4. Using alternate sources of energy like solar energy rather than burning fossil fuels.