The Natural Resources Defense Council has released an interactive Air Quality map of the United States. The map shows the number of days when the concentration of ozone exceeds safe levels. The map also shows areas which suffer from high levels of ragweed pollen.
You can use the map to see the historical tendency for both high ozone and pollen levels at your location. The map also includes a layer which shows areas which suffer from both high levels of smog and high levels of pollen. The combined effect of high ozone and pollen levels can be particularly dangerous for asthma sufferers
If you select a state on the map you can view the percentage of the population living in counties reported to have ragweed and unhealthy smog days. You can also view the number of adults and children who suffer from asthma in the state.
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