Seasonal Air Quality Patterns
Understand how air quality changes throughout the year. Discover seasonal patterns, regional differences, and optimal times for outdoor activities across major US cities.
Air Quality by Season
Spring Air Quality
March-May patterns, pollen levels, and outdoor activity guidance
Summer Air Quality
June-August ozone levels, heat impacts, and health precautions
Fall Air Quality
September-November trends, wildfire impacts, and activity planning
Winter Air Quality
December-February inversions, wood smoke, and cold weather pollution
Specialized Seasonal Topics
Wildfire Season Guide
Tracking wildfire smoke impacts, protection strategies, and peak months
Pollen Season & AQI
How pollen seasons affect air quality and respiratory health
Ozone Season Guide
Summer ozone formation, peak times, and vulnerable populations
Winter Inversion Guide
Temperature inversions, trapped pollution, and health impacts
Planning & Relocation Guides
Best Time to Visit Cities
Optimal months for travel based on air quality patterns
Worst Air Quality Months
When to expect poor air quality by region and city
Year-Round Clean Air Cities
Cities with consistently good AQI across all seasons
Retirement Location Guide
Best cities for retirees considering year-round air quality
Moving Guide: Air Quality
Comprehensive air quality considerations when relocating
Key Seasonal Patterns
Best Air Quality Months
- •October-November: Post-summer, pre-winter inversion
- •March-April: Spring transitions with lower ozone
- •Early December: Before winter heating season peaks
Worst Air Quality Months
- •July-August: Peak ozone season and wildfire smoke
- •January-February: Winter inversions trap pollution
- •September: Extended wildfire season in Western states
Regional Seasonal Differences
West Coast
Summer wildfire season dominates air quality patterns. Best months: October-May.
Mountain West
Winter inversions in valleys create pollution traps. Best months: June-September.
East Coast
Summer ozone and humidity. Most consistent year-round air quality.