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Air quality · Arizona, United States

Phoenix Air Quality Index (AQI) today

Modelled estimate for 05:00 local time (UTC-7), refreshed 3 Nov, 07:52 UTC+0.

70 Moderate

Live estimate · modelled

US EPA AQI05:00 UTC-7, 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 69.

Over the next 24 hours the model expects the AQI to range from 50 around 15:00 to 92 around 23:00 (3 Nov).

389th most polluted of 849 cities worldwide right now, 6th 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

06:00 · 54 07:00 · 58 08:00 · 65 09:00 · 64 10:00 · 61 11:00 · 58 12:00 · 55 13:00 · 54 14:00 · 55 15:00 · 55 16:00 · 55 17:00 · 56 18:00 · 61 19:00 · 68 20:00 · 76 21:00 · 83 22:00 · 88 23:00 · 90 00:00 · 89 01:00 · 86 02:00 · 83 03:00 · 79 04:00 · 74 05:00 · 70 06:00 · 65 07:00 · 61 08:00 · 58 09:00 · 57 10:00 · 55 11:00 · 53 12:00 · 52 13:00 · 52 14:00 · 51 15:00 · 50 16:00 · 50 17:00 · 54 18:00 · 63 19:00 · 72 20:00 · 82 21:00 · 88 22:00 · 91 23:00 · 92 00:00 · 90 01:00 · 87 02:00 · 82 03:00 · 76 04:00 · 71 05:00 · 66 06:00 · 61 07:00 · 59 08:00 · 61 09:00 · 62 10:00 · 59 11:00 · 58 12:00 · 60 13:00 · 61 14:00 · 62 15:00 · 62 16:00 · 63 17:00 · 65 18:00 · 72 19:00 · 81 20:00 · 90 21:00 · 100 22:00 · 112 23:00 · 118 00:00 · 119 Now

US EPA AQI per hour, UTC-7. 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 06:0054
Mon 07:0058
Mon 08:0065
Mon 09:0064
Mon 10:0061
Mon 11:0058
Mon 12:0055
Mon 13:0054
Mon 14:0055
Mon 15:0055
Mon 16:0055
Mon 17:0056
Mon 18:0061
Mon 19:0068
Mon 20:0076
Mon 21:0083
Mon 22:0088
Mon 23:0090
Tue 00:0089
Tue 01:0086
Tue 02:0083
Tue 03:0079
Tue 04:0074
Tue 05:00 · Now70
Tue 06:00 · Forecast65
Tue 07:00 · Forecast61
Tue 08:00 · Forecast58
Tue 09:00 · Forecast57
Tue 10:00 · Forecast55
Tue 11:00 · Forecast53
Tue 12:00 · Forecast52
Tue 13:00 · Forecast52
Tue 14:00 · Forecast51
Tue 15:00 · Forecast50
Tue 16:00 · Forecast50
Tue 17:00 · Forecast54
Tue 18:00 · Forecast63
Tue 19:00 · Forecast72
Tue 20:00 · Forecast82
Tue 21:00 · Forecast88
Tue 22:00 · Forecast91
Tue 23:00 · Forecast92
Wed 00:00 · Forecast90
Wed 01:00 · Forecast87
Wed 02:00 · Forecast82
Wed 03:00 · Forecast76
Wed 04:00 · Forecast71
Wed 05:00 · Forecast66
Wed 06:00 · Forecast61
Wed 07:00 · Forecast59
Wed 08:00 · Forecast61
Wed 09:00 · Forecast62
Wed 10:00 · Forecast59
Wed 11:00 · Forecast58
Wed 12:00 · Forecast60
Wed 13:00 · Forecast61
Wed 14:00 · Forecast62
Wed 15:00 · Forecast62
Wed 16:00 · Forecast63
Wed 17:00 · Forecast65
Wed 18:00 · Forecast72
Wed 19:00 · Forecast81
Wed 20:00 · Forecast90
Wed 21:00 · Forecast100
Wed 22:00 · Forecast112
Wed 23:00 · Forecast118
Thu 00:00 · Forecast119

Pollutants this hour

  • PM2.5 16.6 µg/m³ 24-hour mean 18.8 µg/m³ · 1.3× WHO’s 24-hour guideline (15) 70
  • PM10 21 µg/m³ 22
  • O₃ 22 µg/m³ 9
  • NO₂ 28 µg/m³ 13
  • SO₂ 1 µg/m³ 0
  • CO 0.33 mg/m³ 3

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
Mexicali Mexico 65
Tijuana Mexico 60
San Diego California 69
Hermosillo Mexico 16
El Paso Texas 27
Ciudad Juárez Mexico 27
Los Angeles California 88

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 Phoenix’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 Phoenix right now?
70 on the US EPA scale (Moderate) at 05:00 UTC-7, 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 Phoenix 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 Phoenix get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 50 around 15:00 to 92 around 23:00 (3 Nov). Forecasts beyond a day are less certain.

How does Phoenix compare with other cities?
Right now it is the 389th most polluted of 849 cities we track worldwide, and 6th of 25 in United States, all on the same US EPA scale.

Why does another app show a different AQI for Phoenix?
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.