Importance of Clean Air
Essential for the survival of living things and for staying healthy
Four common air pollutants
carbon monoxide, nitrogen oxides, particulate matter, and sulfur dioxide
Source of carbon monoxide
Formed from the incomplete burning of fossil fuels
Two sources of nitrogen oxides
(1) Burning of nitrogen in hot vehicle engines; (2) Produced by lightning activity
Two sources of particulate matter
(1) Forest fires (2) Burning of fossil fuels
Two sources of sulfur dioxide
(1) Released during volcanic eruptions ; (2) Burning of fossil fuels
Two pollutants causing acid rain
nitrogen oxides and sulfur dioxide
Why is carbon monoxide poisonous?
It reduces the ability of blood to carry oxygen to the body
Common health effect of all pollutants
All four major pollutants cause respiratory problems
Two effects of acid rain
(1) Kills plants and fish; (2) Corrodes buildings and statues
PSI Meaning & Purpose
Pollutant Standards Index; it is used to measure air quality
Health effect of haze
Irritation of the eyes, nose and throat
Ways to reduce air pollution
(1) Use public transport, walk, cycle, (2) Switch off idling engines

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