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Air quality · Baja California, Mexico

Mexicali Air Quality Index (AQI) today

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

65 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 51.

Over the next 24 hours the model expects the AQI to range from 34 around 15:00 to 74 around 00:00 (4 Nov).

439th most polluted of 849 cities worldwide right now, 7th of 22 in Mexico.

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 · 23 06:00 · 23 07:00 · 27 08:00 · 30 09:00 · 28 10:00 · 25 11:00 · 24 12:00 · 26 13:00 · 28 14:00 · 31 15:00 · 35 16:00 · 38 17:00 · 40 18:00 · 39 19:00 · 44 20:00 · 52 21:00 · 55 22:00 · 58 23:00 · 61 00:00 · 63 01:00 · 65 02:00 · 66 03:00 · 66 04:00 · 65 05:00 · 65 06:00 · 66 07:00 · 69 08:00 · 71 09:00 · 67 10:00 · 60 11:00 · 55 12:00 · 51 13:00 · 44 14:00 · 38 15:00 · 34 16:00 · 38 17:00 · 40 18:00 · 48 19:00 · 55 20:00 · 61 21:00 · 66 22:00 · 70 23:00 · 72 00:00 · 74 01:00 · 74 02:00 · 74 03:00 · 73 04:00 · 72 05:00 · 71 06:00 · 71 07:00 · 72 08:00 · 70 09:00 · 64 10:00 · 61 11:00 · 57 12:00 · 54 13:00 · 52 14:00 · 49 15:00 · 47 16:00 · 47 17:00 · 50 18:00 · 53 19:00 · 56 20:00 · 58 21:00 · 60 22:00 · 63 23:00 · 65 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 05:0023
Mon 06:0023
Mon 07:0027
Mon 08:0030
Mon 09:0028
Mon 10:0025
Mon 11:0024
Mon 12:0026
Mon 13:0028
Mon 14:0031
Mon 15:0035
Mon 16:0038
Mon 17:0040
Mon 18:0039
Mon 19:0044
Mon 20:0052
Mon 21:0055
Mon 22:0058
Mon 23:0061
Tue 00:0063
Tue 01:0065
Tue 02:0066
Tue 03:0066
Tue 04:00 · Now65
Tue 05:00 · Forecast65
Tue 06:00 · Forecast66
Tue 07:00 · Forecast69
Tue 08:00 · Forecast71
Tue 09:00 · Forecast67
Tue 10:00 · Forecast60
Tue 11:00 · Forecast55
Tue 12:00 · Forecast51
Tue 13:00 · Forecast44
Tue 14:00 · Forecast38
Tue 15:00 · Forecast34
Tue 16:00 · Forecast38
Tue 17:00 · Forecast40
Tue 18:00 · Forecast48
Tue 19:00 · Forecast55
Tue 20:00 · Forecast61
Tue 21:00 · Forecast66
Tue 22:00 · Forecast70
Tue 23:00 · Forecast72
Wed 00:00 · Forecast74
Wed 01:00 · Forecast74
Wed 02:00 · Forecast74
Wed 03:00 · Forecast73
Wed 04:00 · Forecast72
Wed 05:00 · Forecast71
Wed 06:00 · Forecast71
Wed 07:00 · Forecast72
Wed 08:00 · Forecast70
Wed 09:00 · Forecast64
Wed 10:00 · Forecast61
Wed 11:00 · Forecast57
Wed 12:00 · Forecast54
Wed 13:00 · Forecast52
Wed 14:00 · Forecast49
Wed 15:00 · Forecast47
Wed 16:00 · Forecast47
Wed 17:00 · Forecast50
Wed 18:00 · Forecast53
Wed 19:00 · Forecast56
Wed 20:00 · Forecast58
Wed 21:00 · Forecast60
Wed 22:00 · Forecast63
Wed 23:00 · Forecast65

Pollutants this hour

  • PM2.5 16.5 µg/m³ 24-hour mean 9.3 µg/m³ · within WHO’s 24-hour guideline (15) 65
  • PM10 18 µg/m³ 17
  • O₃ 8 µg/m³ 5
  • NO₂ 58 µg/m³ 28
  • SO₂ 4 µg/m³ 1
  • CO 0.16 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
Tijuana Baja California 60
San Diego United States 69
Los Angeles United States 88
Phoenix United States 70
Hermosillo Sonora 16
San Jose United States 59
El Paso United States 27

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 Mexicali’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 Mexicali right now?
65 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 Mexicali 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 Mexicali get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 34 around 15:00 to 74 around 00:00 (4 Nov). Forecasts beyond a day are less certain.

How does Mexicali compare with other cities?
Right now it is the 439th most polluted of 849 cities we track worldwide, and 7th of 22 in Mexico, all on the same US EPA scale.

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