Worst air pollution Fairmount Park - Philadelphia, today and tomorrow
Today (20 September): Air quality in Fairmount Park is fair. AQI, PM2.5, and NO2 are fair; PM10, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (NO2: 22.7/100).
Tomorrow (21 September 2026): Air quality in Fairmount Park is fair. PM2.5 decreases to good; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 3:00 PM (NO2: 23.8/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Philadelphia's Fairmount Park air quality benefits from the 2,000-acre Schuylkill River valley park providing exceptional natural filtration and clean-air buffering along Philadelphia's western corridor. Vehicle traffic on Kelly Drive and the surrounding residential corridors contribute modest local sources, while the extensive park woodland and the Schuylkill River valley's natural ventilation generally maintain Fairmount Park among Philadelphia's cleaner major urban park environments throughout most of the year.
Today - 20 September | Pollution peaks at 14:00
AQI:
Fair
22.7/100
PM2.5 (fine particles):
Fair
21.6/100
PM10 (coarse particles):
Good
16.5/100
NO2 (nitrogen dioxide):
Fair
22.7/100
O3 (ozone):
Good
18.3/100
SO2 (sulfur dioxide):
Good
1.1/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
2.7/100
PM1 (ultrafine particles):
Good
17.0/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 15:00
AQI:
Fair
23.8/100
PM2.5 (fine particles):
Good
14.0/100
PM10 (coarse particles):
Good
12.6/100
NO2 (nitrogen dioxide):
Fair
23.8/100
O3 (ozone):
Fair
22.5/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
7.3/100
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Frequently Asked Questions
Is air quality bad in Fairmount Park right now?
On 20 September 2026, overall air quality in Fairmount Park is fair. AQI is the main air quality indicator at 22.7/100. Pollution peaks around 2:00 PM (NO2: 22.7/100).
Will air quality be worse tomorrow in Fairmount Park?
On 21 September 2026, air quality conditions in Fairmount Park will be similar to today, with AQI forecast at fair at 23.8/100. Pollution peaks around 3:00 PM (NO2: 23.8/100).
When is air pollution at its worst in Fairmount Park?
Seasonal changes shape air quality at Fairmount Park much as they do across Philadelphia — the calmest air of the year usually arrives well after the summer ozone season fades, whereas extended summer heat waves, often worsened by regional haze, bring the toughest air quality stretch. Dense urban traffic corridors add a persistent background level of pollution that varies less by season than ozone does.
Are air quality levels in Fairmount Park based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 20 September 2026 at 14:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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