The EPA just released updated indoor air quality guidelines that Pacific Northwest homeowners should pay attention to. The new standards reflect current research on what makes indoor environments healthy—and they’re stricter than what most homes currently achieve.
The Big Changes for 2025
The updated guidelines focus on three areas: particulate matter filtration, ventilation rates, and carbon dioxide monitoring in homes. For Seattle-area residents, the most relevant change involves filter recommendations—MERV 13 or higher could become the new minimum standard instead of MERV 8.
What This Means for Your Home
Older HVAC systems may need evaluation. According to the new guidelines, combining proper filtration with adequate ventilation can cut indoor pollution by up to 70%. That’s a significant improvement for respiratory health, especially during wildfire season.
Local HVAC contractors report increased interest in air quality assessments since the announcement. If you’re considering upgrades, now’s a good time to schedule an evaluation before the rush.
More updates on air quality regulations affecting Northwest homes coming soon.
