The role of pollution
There are three important pollutants:
- nitrogen oxides:
- increasing
- increasing
- sulphur dioxide:
- remaining stable
- remaining stable
- ozone:
- worse in the summer
- worse in the summer
- black smoke:
- decreasing
Pollutants can be shown to precipitate bronchoconstriction in individuals with asthma. The role of pollution in the increased prevalence of asthma is not understood.
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