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Essay heading: A Cleaner Breath
 
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Issue: Science
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Date added: July 27, 2009
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No of pages / words: 10 / 2592
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NO2 is a brown gas and at sufficiently high levels can contribute to urban haze, hence the smog that laypeople in big cities complain about. However, a more serious problem is that NO2 can absorb sunlight and break apart to produce oxygen atoms that combine with the O2 in the air to produce ozone (O3)...
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Ozone is a powerful oxidizing agent, and a toxic gas. In North America elevated levels of tropospheric ozone cause several billion dollars per year damage to crops (45 million/per year in Ontario), structures, forests, and human health. It is believed that the natural level of ozone in the clean troposphere is 10 to 15 parts-per-billion...
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