Find the Best U.S. Cities to Live In
Based on Long-Term Air Quality
Compare 653 U.S. cities using 2021-2025 EPA data, not just today's AQI. Clean Air Data is built for relocation, home-buying, and long-term planning.
Trending Daily AQI Reports
Built For Relocation Decisions
One score, with the inputs visible
Every city page shows the long-term inputs behind the score: annual PM2.5, unhealthy days, 5-year trend, seasonal variability, extreme events, and data coverage.
Scan the cleanest cities list, then narrow by state, metro, or relocation goal.
Open national ranking →See exactly what drove the score before you trust it.
Read the methodology →Use city profiles and head-to-head comparisons to pressure-test a move.
Browse city profiles →๐ Cleanest Cities 2026 View Top 10 Report
๐ Most Improved (5-Year) View Top 10 Report
Clean Air Data FAQs
How is the Clean Air Score calculated?
We combine EPA PM2.5 and AQI trend data from 2021-2025 into a transparent weighted score. See our full scoring formula on the methodology page.
Where can I find 5-day air quality forecasts?
Every city and ZIP code page includes a 5-day AQI forecast powered by WAQI, but our main rankings are built for long-term relocation decisions using EPA historical data.
How accurate is the air quality data?
We strictly rely on official U.S. Environmental Protection Agency (EPA) historical data from monitoring stations as the sole basis for our long-term scores and rankings. Forecasts are provided by WAQI.
Can I search by ZIP code?
Yes. Enter a 5-digit ZIP code in the search box to open the ZIP air quality page directly.
Which cities have the cleanest air in 2026?
Use our Cleanest Cities ranking to compare top performers and drill into each city profile for trend details.