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Get Away from the Road
That is, if you live too close to a freeway or major road. One of the strongest toxins in the air—PM2.5—nearly doubles the risk of death stemming from respiratory causes. The biggest factor for PM2.5 other than mites inside your home: traffic density. That's why we recommend that you live at least 100 meters and preferably 300 meters from a major road (300 meters is about the size of three football fields). At the same time, encourage tougher government standards on pollution by writing the EPA, your senator, and your representative. More stringent guidelines for certain pollution (particles in the 2.5 to 10 micron range often produced by coal plants and diesel fuel) provide reasonable goals for most urban environments.