How we work

IndoorAirLab is an independent site run by Will. Here is how the guides are made.

Research

Guides are based on peer-reviewed studies, public health agencies (such as the U.S. EPA, Health Canada, and national public health institutes), and published standards. Every guide links its sources so you can check them.

Evidence ratings

Each guide opens with a short box rating its main claims:

• Official guidance: a recommendation from a government agency or a published standard.
• Consistent evidence: several studies point the same way, even if the size of the effect varies.
• Limited evidence: a few studies, lab-only results, or results that depend heavily on the product.
• Weak or uncertain: very small studies, mixed results, or claims that come only from manufacturers.

Product comparisons and testing

Product comparisons currently use manufacturer-reported specifications. We are setting up our own testing, and we will publish the method, equipment, and raw results before any page says a product was tested.

Money and independence

We earn affiliate commissions on some links. Commissions never change our rankings or recommendations, and we do not accept payment for placement. If a company sends us a product for free, the review will say so. See our affiliate disclosure.

Corrections

If you spot an error, email [email protected]. We will fix it and note the change on the page.