Since we need oxygen to live, carbon monoxide pollution can be harmful to anyone, but it is most harmful for people with already low oxygen levels. Nitrogen oxides are another type of air pollutant, also from emissions from cars, trucks, buses, power plants, and off-road equipment.

1. POLLUTANTS OFAIR
AND
THEIR SOURCES
PRESENTED BY : Nandita & Gitika

2. “Environmental issues are
defined as harmful effects to Earth and
its natural systems due to the actions of
humans.”
Environmental Issues means any
negative or adverse effect on a natural
resource caused by human impact(s)
such as excessive use of pesticides,
petroleum products, pharmaceuticals,
recreation, and sediment.

3. ENVIRONMENTAL CONCERNS

4. AIR
POLLUTION
“Air Pollution is the release of pollutants
such as gases, particles, biological
molecules, etc. into the air that is harmful to
human health and the environment.”
This can be in the form of excessive gases
like carbon dioxide and other vapours that
cannot be effectively removed through
natural cycles, such as the carbon cycle or
the nitrogen cycle.
Air pollution is a mixture of solid particles and gases in
the air. Car emissions, chemicals from factories, dust,
pollen and mold spores may be suspended as particles.
Ozone, a gas, is a major part of air pollution in cities.
When ozone forms air pollution, it's also called smog.
Some air pollutants are poisonous.

5. AIR POLLUTANTS
Primary pollutants enter the air directly. Some are released by natural processes, like ash
from volcanoes. Most are released by human activities.
◦ Carbon oxides
◦ Nitrogen oxides
◦ Sulfur oxides
◦ Toxic heavy metals
◦ Volatile organic compounds (VOCs)
◦ Particulates
Secondary pollutants are the pollutants that are formed when other primary pollutants interact with
the atmosphere. They pollute our environment indirectly and are not emitted from a source, but are
activated or synthesized by other pollutants as they are emitted.
Example: Ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine
in the presence of sunlight.

6. SOURCES OF AIR
POLLUTANTS
◦ Most pollutants enter the air when fossil
fuels burn.
◦ Some are released when forests burn.
◦ Others evaporate into the air.
Burning Fossil Fuels
Burning fossil fuels releases many pollutants into the air. These pollutants include carbon monoxide, carbon dioxide,
nitrogen dioxide, and sulphur dioxide.
Burning Forests
Millions of acres of forest have been cut and burned to make way for farming. Burning trees produces most of the
same pollutants as burning fossil fuels.

7. Evaporation of VOCs (Volatile Organic Compound)
VOCs enter the air by evaporation. VOCs are found in many products, like paints
and petroleum products. Methane is a VOC that evaporates from livestock waste and
landfills.
Other Common Sources of AIR POLLUTANTS
• 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

8. THANKYOU