Philadelphia, PA Air Quality & Indoor Air Guide | AQI, PM2.5 Trends
AQI, PM2.5, and Live Environmental Data for Philadelphia, PA
Long-term air quality
What this page tells you
This page combines annual PM2.5, unhealthy days, 5-year trend, and data coverage so you can compare long-term air quality, not just today's reading.
🌍 Live Air Quality in Philadelphia
Real-time pollutants resolved via none
Last 24 Hours: Philadelphia AQI Trend
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Regional Air Quality Context
Philadelphia is treated as a major metro in PA, so the most useful signal is the long-term pollution baseline rather than a single live AQI reading. Annual PM2.5 averages 8.5 ug/m3, with roughly 0 unhealthy-air days per year, and the multi-year trend is relatively stable. Its Clean Air Score is 69.3 (grade C), which helps compare Philadelphia with other PA cities. This report uses direct city-level monitor coverage where available, so the trend is tied closely to conditions in Philadelphia.
Fine particulate matter (PM2.5) in Philadelphia is monitored for health safety. Long-term exposure to pollutants can lead to respiratory issues, making daily checks essential for active residents in PA.
Indoor Air Quality in Philadelphia, PA
Outdoor pollution can still affect indoor air when windows are open, filtration is weak, or wildfire smoke moves in.
Usually safe to open windows for fresh air.
Air purifier is optional for most households.
Normal indoor and outdoor activity is fine.
Ventilate selectively; sensitive groups should watch symptoms.
Run HEPA filtration on low if pollen, smoke smell, or traffic exhaust is noticeable.
Most people can continue normal activity; sensitive groups should keep an eye on AQI.
Keep windows closed so outdoor PM2.5 does not build indoors.
Run HEPA filtration in bedrooms and main living spaces.
Children, older adults, and people with asthma should reduce outdoor exertion.
Keep windows and doors sealed as much as practical.
Run filtration continuously; use the highest comfortable fan setting.
Stay indoors when possible and consider an N95 if you must go outside.
Health Recommendations
Most people can continue outdoor activities normally. Keep an eye on changing conditions.
Children and elderly should reduce prolonged or heavy outdoor exertion if AQI rises above 50.
Frequently Asked Questions about Philadelphia Air Quality
Is air quality in Philadelphia safe today?
Current air quality in Philadelphia is being monitored. Based on historical data, Philadelphia has a clean air score of 69.3. For real-time updates, check the live monitoring panel on this page.
What is a dangerous AQI level?
An AQI (Air Quality Index) above 100 is considered unhealthy for sensitive groups, while levels above 150 are unhealthy for everyone. Levels above 300 are hazardous.
Should I wear a mask today in Philadelphia?
If the AQI in Philadelphia is above 150, an N95 mask is recommended for outdoor activities to filter out fine particulate matter (PM2.5).