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CHEMISTRY
C1- Air Quality
Pollutants in the Air

Pollutants are chemicals. They can harm the environment and our health.

Human actions such as burning fossil fuels release pollutants into the atmosphere, e.g. from power
stations or cars.

Pollutants can harm us indirectly. For example, acid rain makes rivers too acidic…

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Pollution Data

Data can test a theory or an explanation,

Carbon monoxide (CO) is an example of a pollutant caused by humans. Concentrations are likely to
be higher in populated areas, e.g. cities.

The following data was collected in two places on the same day with a CO metre:

Time…

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The mean CO concentration in the city is significantly higher than in the country park. This supports
the theory that CO is a pollutant caused by human activity.

There's a real difference between the mean CO concentrations in the city and the park. This is
because the difference between the…

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hydrogen and carbon atoms and produce carbon dioxide and water (hydrogen oxide) when burned
in air.



Incomplete combustion

Incomplete combustion occurs when fuel is burned and there's not enough oxygen. Depending on
the amount of oxygen present, carbon particulates or carbon monoxide may be produced.

Incomplete combustion occurs in car…

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In some volunteers the skin became red and inflamed, indicating allergic reaction. The study showed
that people with pollen allergy also had hay fever and those who didn't have pollen allergy didn't get
hay fever.

This provided stronger evidence of a link between pollen and hay fever.

Repeated skin tests…

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In 1997 an international meeting about climate change in Kyoto, Japan, set targets to lower emissions
for individual countries. Each country's government must take appropriate measures to meet its
target.



National choices

Government rules and regulations include:

Legal limits for exhausts emissions, enforced by MOT tests. Compulsory catalytic converters.
Subsidies…

Comments

renee OKHIRIA

really good thanks

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