YourHealthyHome is a fantastic resource, put together by The Lung Association of Canada, that provides interactive tips on improving air quality in and around your home.

To clarify, this site gives visitors a room-by-room guide to help identify and evaluate common indoor environmental problems that may be affecting your home and your health. Tools are provided to help solve common outdoor and indoor air quality problems and change energy-wasting habits. Major sources of poor air quality and energy wasters in your basement, laundry area, living room, kitchen, bathroom and bedrooms are identified. Problem areas on the exterior of your house, as well as grass and trees, are also included.

It’s a pretty well done site, actually.