Multiple sources report that when wildfire smoke causes indoor air to become smoky or hazy, health experts recommend taking steps to reduce exposure. The guidance focuses on keeping people indoors when conditions outside are unsafe and improving indoor air quality by limiting smoke entry through windows and doors. Sources also emphasize using appropriate filtration where available, such as air purifiers with high-efficiency filters, to help capture airborne particles associated with wildfire smoke. They note that maintaining clean indoor air can require running fans or filters continuously for the period of poor outdoor air quality. In addition, sources advise following local air-quality updates so residents can act when conditions worsen and continue protections until the smoke clears. Overall, the advice is presented as practical harm-reduction for everyday households during active wildfire events, aiming to lower inhalation of fine particulate matter linked to health risks.