California set its limit at 70 three years ago
Heritage Foundation (yeah I know) takes the opposite side. Interesting point, for some time, conditions that are actually too clean have been implicated in asthma:
Quote:
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The EPA identifies a number of health risks associated with breathing ozone, most of which involve harmful respiratory effects. Still, the correlation and severity of these risks, especially for asthma, are unclear. From 1980 to 2005, when levels of ozone and other pollutants fell in the United States, the number of asthmatics increased by 75 percent. In fact, some of the lowest asthma rates in the world are found in highly polluted developing countries in the former Soviet Union, while countries in Western Europe have considerably higher asthma rates and relatively lower levels of air pollution.
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They also note that ground-level ozone has the same protective effect against UV radiation as upper-level, so reducing ground-level ozone will increase skin cancer rates. Interesting.