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Air quality · California, United States

Los Angeles Air Quality Index (AQI) today

Modelled estimate for 04:00 local time (UTC-8), refreshed 3 Nov, 07:52 UTC+0.

88 Moderate

Live estimate · modelled

US EPA AQI04:00 UTC-8, 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 67.

Over the next 24 hours the model expects the AQI to range from 57 around 17:00 to 94 around 03:00 (4 Nov).

236th most polluted of 849 cities worldwide right now, 2nd 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

05:00 · 66 06:00 · 64 07:00 · 63 08:00 · 64 09:00 · 62 10:00 · 59 11:00 · 58 12:00 · 58 13:00 · 58 14:00 · 58 15:00 · 58 16:00 · 58 17:00 · 58 18:00 · 59 19:00 · 59 20:00 · 60 21:00 · 63 22:00 · 66 23:00 · 70 00:00 · 75 01:00 · 81 02:00 · 85 03:00 · 88 04:00 · 88 05:00 · 89 06:00 · 90 07:00 · 92 08:00 · 90 09:00 · 86 10:00 · 79 11:00 · 70 12:00 · 66 13:00 · 63 14:00 · 61 15:00 · 59 16:00 · 58 17:00 · 57 18:00 · 57 19:00 · 59 20:00 · 62 21:00 · 65 22:00 · 71 23:00 · 77 00:00 · 82 01:00 · 88 02:00 · 92 03:00 · 94 04:00 · 93 05:00 · 91 06:00 · 90 07:00 · 90 08:00 · 90 09:00 · 88 10:00 · 88 11:00 · 85 12:00 · 83 13:00 · 82 14:00 · 80 15:00 · 79 16:00 · 77 17:00 · 74 18:00 · 72 19:00 · 71 20:00 · 72 21:00 · 73 22:00 · 74 23:00 · 77 Now

US EPA AQI per hour, UTC-8. 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 05:0066
Mon 06:0064
Mon 07:0063
Mon 08:0064
Mon 09:0062
Mon 10:0059
Mon 11:0058
Mon 12:0058
Mon 13:0058
Mon 14:0058
Mon 15:0058
Mon 16:0058
Mon 17:0058
Mon 18:0059
Mon 19:0059
Mon 20:0060
Mon 21:0063
Mon 22:0066
Mon 23:0070
Tue 00:0075
Tue 01:0081
Tue 02:0085
Tue 03:0088
Tue 04:00 · Now88
Tue 05:00 · Forecast89
Tue 06:00 · Forecast90
Tue 07:00 · Forecast92
Tue 08:00 · Forecast90
Tue 09:00 · Forecast86
Tue 10:00 · Forecast79
Tue 11:00 · Forecast70
Tue 12:00 · Forecast66
Tue 13:00 · Forecast63
Tue 14:00 · Forecast61
Tue 15:00 · Forecast59
Tue 16:00 · Forecast58
Tue 17:00 · Forecast57
Tue 18:00 · Forecast57
Tue 19:00 · Forecast59
Tue 20:00 · Forecast62
Tue 21:00 · Forecast65
Tue 22:00 · Forecast71
Tue 23:00 · Forecast77
Wed 00:00 · Forecast82
Wed 01:00 · Forecast88
Wed 02:00 · Forecast92
Wed 03:00 · Forecast94
Wed 04:00 · Forecast93
Wed 05:00 · Forecast91
Wed 06:00 · Forecast90
Wed 07:00 · Forecast90
Wed 08:00 · Forecast90
Wed 09:00 · Forecast88
Wed 10:00 · Forecast88
Wed 11:00 · Forecast85
Wed 12:00 · Forecast83
Wed 13:00 · Forecast82
Wed 14:00 · Forecast80
Wed 15:00 · Forecast79
Wed 16:00 · Forecast77
Wed 17:00 · Forecast74
Wed 18:00 · Forecast72
Wed 19:00 · Forecast71
Wed 20:00 · Forecast72
Wed 21:00 · Forecast73
Wed 22:00 · Forecast74
Wed 23:00 · Forecast77

Pollutants this hour

  • PM2.5 29.7 µg/m³ 24-hour mean 17.6 µg/m³ · 1.2× WHO’s 24-hour guideline (15) 88
  • PM10 31 µg/m³ 28
  • O₃ 0 µg/m³ 2
  • NO₂ 70 µg/m³ 35
  • SO₂ 3 µg/m³ 1
  • CO 0.27 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
San Diego California 69
Tijuana Mexico 60
Mexicali Mexico 65
San Jose California 59
San Francisco California 55
Phoenix Arizona 70
Hermosillo Mexico 16

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 Los Angeles’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 Los Angeles right now?
88 on the US EPA scale (Moderate) at 04:00 UTC-8, 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 Los Angeles 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 Los Angeles get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 57 around 17:00 to 94 around 03:00 (4 Nov). Forecasts beyond a day are less certain.

How does Los Angeles compare with other cities?
Right now it is the 236th most polluted of 849 cities we track worldwide, and 2nd of 25 in United States, all on the same US EPA scale.

Why does another app show a different AQI for Los Angeles?
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.