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  • Avoid physical exertion and stay indoors as much as possible.
  • Keep doors and windows closed when possible. Run an air conditioner—if you have one—and set it to re-circulate.
  • Shop for a high efficiency particulate air (HEPA) filter if someone in your home has asthma, chronic obstructive pulmonary disease (COPD), or a history of heart disease or stroke.
  • Make your own air filter with a box fan and about $25 in supplies if you can’t afford a HEPA filter.