the cause of air pollution.............作文!!急急急急急!10分

Health effects from air pollution come about due to a combination of the concentration of the air pollutants and the amount of time you are exposed to the air pollution. Brief exposure to moderately high pollution levels will normally not lead to any significant problem. For most of us, therefore, the general air pollution is more relevant as it represents the air pollution that we shall be exposed to for most of the time. For the Roadside air pollution, although it is naturally higher on a given day due to the close proximity to vehicle emission sources, it is less relevant as we often spend only quite short periods of the day in busy streets and roads.

Intro:
How serious is the problem? It's impacts. (1 or 2 sentences is good enough).

Body:
Think of different sectors (e.g. industry, transport, power plant, waste treatment ...etc). Elaborate on each of them:WHAT is emitted, HOW it is spreaded / other factors helps..etc. Present them in sequence of majority. It's good to back up your argument with figures and statistics.

Conclus'n:
For above, summarized the main cause of air pollution.