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Air quality · Pennsylvania, United States

Philadelphia Air Quality Index (AQI) today

Modelled estimate for 07:00 local time (UTC-5), refreshed 3 Nov, 07:52 UTC+0.

76 Moderate

Live estimate · modelled

US EPA AQI07:00 UTC-5, 3 Nov Main pollutant: PM2.5

Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.

This page uses EPA’s NowCast, which follows the last few hours, as the US government’s AirNow does. On a 24-hour average of particles, as many apps show, it is 62.

Over the next 24 hours the model expects the AQI to range from 56 around 04:00 to 82 around 08:00 (3 Nov).

332nd most polluted of 849 cities worldwide right now, 3rd of 25 in United States.

What to do today

  • Long walk or run outside OK, lighter if very sensitive
  • Kids playing outside OK
  • Airing the house Open
  • Mask outdoors Not needed

Based on the US EPA’s health statement: “Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

08:00 · 85 09:00 · 79 10:00 · 68 11:00 · 60 12:00 · 55 13:00 · 52 14:00 · 50 15:00 · 48 16:00 · 52 17:00 · 57 18:00 · 63 19:00 · 65 20:00 · 66 21:00 · 66 22:00 · 64 23:00 · 62 00:00 · 59 01:00 · 58 02:00 · 57 03:00 · 58 04:00 · 58 05:00 · 60 06:00 · 64 07:00 · 76 08:00 · 82 09:00 · 78 10:00 · 72 11:00 · 67 12:00 · 64 13:00 · 62 14:00 · 60 15:00 · 58 16:00 · 58 17:00 · 61 18:00 · 64 19:00 · 65 20:00 · 64 21:00 · 63 22:00 · 63 23:00 · 62 00:00 · 61 01:00 · 60 02:00 · 58 03:00 · 57 04:00 · 56 05:00 · 56 06:00 · 57 07:00 · 62 08:00 · 66 09:00 · 67 10:00 · 65 11:00 · 63 12:00 · 61 13:00 · 59 14:00 · 57 15:00 · 55 16:00 · 54 17:00 · 56 18:00 · 59 19:00 · 59 20:00 · 59 21:00 · 59 22:00 · 58 23:00 · 58 00:00 · 57 01:00 · 56 02:00 · 55 Now

US EPA AQI per hour, UTC-5. Particles use EPA’s NowCast (a 12-hour weighted average), ozone and CO an 8-hour average. Lighter bars are the CAMS forecast.

Show as a table
TimeAQI
Mon 08:0085
Mon 09:0079
Mon 10:0068
Mon 11:0060
Mon 12:0055
Mon 13:0052
Mon 14:0050
Mon 15:0048
Mon 16:0052
Mon 17:0057
Mon 18:0063
Mon 19:0065
Mon 20:0066
Mon 21:0066
Mon 22:0064
Mon 23:0062
Tue 00:0059
Tue 01:0058
Tue 02:0057
Tue 03:0058
Tue 04:0058
Tue 05:0060
Tue 06:0064
Tue 07:00 · Now76
Tue 08:00 · Forecast82
Tue 09:00 · Forecast78
Tue 10:00 · Forecast72
Tue 11:00 · Forecast67
Tue 12:00 · Forecast64
Tue 13:00 · Forecast62
Tue 14:00 · Forecast60
Tue 15:00 · Forecast58
Tue 16:00 · Forecast58
Tue 17:00 · Forecast61
Tue 18:00 · Forecast64
Tue 19:00 · Forecast65
Tue 20:00 · Forecast64
Tue 21:00 · Forecast63
Tue 22:00 · Forecast63
Tue 23:00 · Forecast62
Wed 00:00 · Forecast61
Wed 01:00 · Forecast60
Wed 02:00 · Forecast58
Wed 03:00 · Forecast57
Wed 04:00 · Forecast56
Wed 05:00 · Forecast56
Wed 06:00 · Forecast57
Wed 07:00 · Forecast62
Wed 08:00 · Forecast66
Wed 09:00 · Forecast67
Wed 10:00 · Forecast65
Wed 11:00 · Forecast63
Wed 12:00 · Forecast61
Wed 13:00 · Forecast59
Wed 14:00 · Forecast57
Wed 15:00 · Forecast55
Wed 16:00 · Forecast54
Wed 17:00 · Forecast56
Wed 18:00 · Forecast59
Wed 19:00 · Forecast59
Wed 20:00 · Forecast59
Wed 21:00 · Forecast59
Wed 22:00 · Forecast58
Wed 23:00 · Forecast58
Thu 00:00 · Forecast57
Thu 01:00 · Forecast56
Thu 02:00 · Forecast55

Pollutants this hour

  • PM2.5 27.9 µg/m³ 24-hour mean 15.0 µg/m³ · 1.0× WHO’s 24-hour guideline (15) 76
  • PM10 29 µg/m³ 21
  • O₃ 6 µg/m³ 12
  • NO₂ 53 µg/m³ 26
  • SO₂ 2 µg/m³ 0
  • CO 0.44 mg/m³ 2

Modelled concentrations at the city’s location (CAMS). The sub-index uses the same averaging as the headline, so the highest one is the AQI.

Nearby cities

City AQI
New York City New York 74
Washington District of Columbia 61
Boston Massachusetts 68
Toronto Canada 36
Mississauga Canada 34
Ottawa Canada 55
Montreal Canada 57

Where this number comes from

The Copernicus Atmosphere Monitoring Service (CAMS) forecasts air pollution worldwide on a grid (about 11 km over Europe, about 45 km elsewhere). We take the grid value at Philadelphia’s coordinates and score it with the US EPA’s method. It is a model, not a measurement: a nearby monitoring station can read quite differently, especially next to busy roads or during fires and dust storms.

Full methodology · Data: CAMS via Open-Meteo (CC BY 4.0); city list: GeoNames (CC BY 4.0).

  • Good 0–50
  • Moderate 51–100
  • Unhealthy for sensitive groups 101–150
  • Unhealthy 151–200
  • Very unhealthy 201–300
  • Hazardous 301–500

Questions

What is the AQI in Philadelphia right now?
76 on the US EPA scale (Moderate) at 07:00 UTC-5, 3 Nov. PM2.5 is the pollutant with the highest sub-index. This is a modelled estimate from the Copernicus Atmosphere Monitoring Service (CAMS), not a reading from a monitoring station.

Is it safe to exercise outside in Philadelphia today?
For most people, yes. The EPA’s statement for “Moderate”: Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. General guidance, not medical advice.

Will the air in Philadelphia get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 56 around 04:00 to 82 around 08:00 (3 Nov). Forecasts beyond a day are less certain.

How does Philadelphia compare with other cities?
Right now it is the 332nd most polluted of 849 cities we track worldwide, and 3rd of 25 in United States, all on the same US EPA scale.

Why does another app show a different AQI for Philadelphia?
Apps differ in source (government stations, low-cost sensors or a model like this one), in scale (US EPA, European, or a national index) and in averaging (hourly or NowCast, 8-hour, 24-hour). This page uses the US EPA AQI with EPA’s NowCast for particles, computed from the CAMS forecast for the city’s location.