than humans and animals to the effects of air pollution. The three most important pollutants are ozone, sulphur dioxide, and nitrogen dioxide, with a greater impact on annual crops than perennial crops. The Gauteng State of the Environment Report (1995) highlighted the most significant air quality issues as follows; Global warming due to the generation of greenhouse gases such as carbon dioxide, ozone and methane, acid deposition where sulphates and nitrates in the atmosphere are deposited in rain…
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