Solution:
Major air pollutants include CO, CO2, SO2, nitrogen oxides, particulate matter, etc.
1. Carbon monoxide (CO):
Source:
- Incomplete combustion of fossil fuels in automobiles
- Fumes from factories
- Forest fires
Effects:
- Haemoglobin has greater affinity for CO. It competitively interferes with oxygen transport by binding to haemoglobin which forms carboxy haemoglobin.
- In higher concentration, it leads to coma and death
2. Carbon dioxide (CO2):
Source:
- Rapid urbanisation
- Automobiles
- Aero planes
- Power plants
Effects:
- It is the main pollutant that is leading to global warming.
3. Sulphur dioxide (SO2):
Source:
- It is produced by burning of fossil fuel.
- Melting of sulphur ores
Effects:
- SO2, nitrogen oxides are the major causes of acid rain.
- High concentration of can result in breathing problems.
- Exacerbates existing cardiovascular problems.
4. Nitrogen oxides:
Sources:
Mainly auto mobile exhausts.
Effects:
- It is harmful to humans and animals and also for life of plants.
- Nitrogen oxides on plants cause necrotic spots on leaves.
5. Particulate matter: Tiny particles of solid matter suspended in a gas or liquid constitute the particulate matter. Aerosols are a combination of particles or liquid droplets and the gas.
Sources:
- Combustion of fossil fuels
- Forest fires
- Cement factories
Effects:
- Inhalation of particulate matter can lead to respiratory tract infections.
- Lung disorders
- Premature deaths in severe cases