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The effects of air pollutants are multi-dimensional. For example:
- Ozone is a harmful air pollutant on ground level, but it also protects us.
- Chemicals such as DDT (p,p'-dichlorodiphenyltrichloro- ethane), PCBs (polychlorinated biphenyls), PBBs (polybrominated biphenyls), CFCs (chlorofluoro carbons) were once considered very useful, but later were found to be very harmful.
- Some chemicals, for example, carbon tetrachloride, can be carcinogens/toxins, an ozone depleting substance, and a greenhouse gas, at the same time.
- Other pollutants may be harmful, not only to living organisms, but also to buildings and historical heritage sites. One example is acid gases.
The above-mentioned are just a few examples of the complexity of air pollutants. We now focus on some of the immediate health effects of air pollutants.
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