June 12, 2025

EPA Releases Guide to Improving Indoor Air Quality During Wildfire Smoke Events

In May, EPA published a document to help users limit indoor exposures to wildfire smoke, titled Best Practices Guide for Improving Indoor Air Quality in Commercial/Public Buildings During Wildland Fire Smoke Events (PDF). According to EPA, the guide’s purpose is “to provide a concise and complete source of information on the steps that can be taken to reduce the impacts of wildfire smoke indoors in commercial or public buildings.” Individuals and groups with decision-making abilities for these buildings may use the guide to create “Smoke-Ready Plans,” or lists of actions to take before, during, and after smoke events. Staff members of federal, state, local, and tribal environmental and health organizations may also use the document to inform communities on reducing smoke exposures in public or commercial spaces.

The guide states that it is “not intended to provide a rigorous review of mitigation measures for technical audiences.” Experts such as HVAC professionals, architects, design engineers, and construction contractors are instructed to consult standards and guidelines for their industries. In language and format accessible to most members of the public, the guide outlines the health hazards associated with wildfire smoke and the implementation of controls, such as HVAC system improvements, building use and weathering adjustments, portable air cleaners, and air sensors. It also links to publicly available resources providing more information.

A free PDF of the Best Practices Guide for Improving Indoor Air Quality in Commercial/Public Buildings During Wildland Fire Smoke Events may be downloaded from EPA’s website.