Essay heading: A Cleaner Breath

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Science

 

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July 27, 2009

 

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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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