York, Montana Air Quality
York has a median AQI of 45, earning an air quality grade of A- — excellent air quality that ranks better than 27% of US cities. Air quality has remained relatively stable over the past decade. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, York recorded 119 good air quality days (65% of monitored days).
Population: 182 • County: Lewis and Clark
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Quick Facts
| Current AQI | 26 — Good |
| Air Quality Grade | A- |
| Median AQI (2025) | 45 |
| vs. U.S. Cities | Better than 27% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | → Stable |
| Data Source | EPA AirNow |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 30 Days
Current Pollutant Levels
Real-time data from EPA AirNow
AQI Trend (10 Years)
Air Quality Days by Year
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About York Air Quality
What is the air quality in York today?
The current AQI in York is 26, which is rated "Good". Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in York getting better or worse?
Air quality in York has remained relatively stable over the past decade, with a median AQI of around 45.
What is the most common air pollutant in York?
Ozone is the primary air pollutant in York, responsible for the most air quality-impacted days in 2025. Ground-level ozone forms when sunlight reacts with vehicle and industrial emissions on warm days.
How many unhealthy air days does York have per year?
In 2025, York had 0 days when air quality was unhealthy or unhealthy for sensitive groups (AQI above 100). There were 119 good days and 63 moderate days out of 182 days monitored.
What air quality grade does York receive?
York receives an air quality grade of A-, placing it better than 27% of US cities. This grade is based on a median AQI of 45 for 2025, derived from EPA monitoring data.
Air Quality Grade
Better than 27% of US cities
Nearby Cities
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National Rankings
See how York compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for York
Based on your area's air quality (median AQI: 45), we recommend these air purifiers to help protect your health indoors.
RabbitAir MinusA2
Stylish wall-mountable design with customizable artwork panels.
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Other Great Options
Molekule Air Pro
Commercial-grade with patented PECO technology for destroying pollutants.
Blueair Blue Pure 211+
High performance for large rooms with simple operation.
Dyson Pure Cool TP04
Premium all-in-one air purifier and fan with advanced features.
Not sure which air purifier is right for you?
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Read our complete buying guide →