Household activities such as cooking and cleaning produce gases and tiny particles that can pollute indoor air, exacerbate asthma, and contribute to heart disease.

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And during the winter, with your windows closed for warmth, fresh outdoor air can’t dilute pollutants, heightening health risks, says John Balmes, M.D., a professor of medicine at University of California, San Francisco.

Here, CR’s pros help pinpoint trouble spots and suggest helpful tools. To see them, hover your cursor over the green circles in each area of the illustration below.

Check out some of our recommended products for helping to keep your indoor air clean.

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Editor’s Note: This article also appeared in the February 2020 issue of Consumer Reports On Health