Basic steps can be more effective than air purifiers, according to experts, including the U.S. Environmental Protection Agency and the American Lung Association. Less expensive options include:

• Banning indoor smoking
  
  
• Keeping pets out of bedrooms
  
  
• Removing carpeting and other dust-mite harbors
  
  
• Opening windows whenever possible
  
  
• Using outdoor-venting fans in the bathroom and kitchen
  
  
• Maintaining heating equipment
  
  

Avoid ozone generators, which emit hazardous levels of ozone. They should be used only by professionals after serious contamination from a fire or flood, not for routine air cleaning.

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