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Air quality · Baja California, Mexico

Tijuana Air Quality Index (AQI) today

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

60 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 49.

Over the next 24 hours the model expects the AQI to range from 50 around 02:00 to 70 around 08:00 (3 Nov).

495th most polluted of 849 cities worldwide right now, 9th 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 · 41 06:00 · 39 07:00 · 46 08:00 · 47 09:00 · 42 10:00 · 39 11:00 · 38 12:00 · 38 13:00 · 39 14:00 · 41 15:00 · 44 16:00 · 46 17:00 · 48 18:00 · 50 19:00 · 50 20:00 · 50 21:00 · 49 22:00 · 48 23:00 · 49 00:00 · 52 01:00 · 54 02:00 · 56 03:00 · 58 04:00 · 60 05:00 · 64 06:00 · 66 07:00 · 69 08:00 · 70 09:00 · 69 10:00 · 67 11:00 · 66 12:00 · 65 13:00 · 64 14:00 · 63 15:00 · 63 16:00 · 62 17:00 · 63 18:00 · 62 19:00 · 61 20:00 · 59 21:00 · 56 22:00 · 54 23:00 · 52 00:00 · 52 01:00 · 51 02:00 · 50 03:00 · 51 04:00 · 53 05:00 · 55 06:00 · 58 07:00 · 61 08:00 · 62 09:00 · 61 10:00 · 58 11:00 · 56 12:00 · 54 13:00 · 53 14:00 · 52 15:00 · 52 16:00 · 52 17:00 · 52 18:00 · 52 19:00 · 52 20:00 · 53 21:00 · 53 22:00 · 54 23:00 · 55 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 05:0041
Mon 06:0039
Mon 07:0046
Mon 08:0047
Mon 09:0042
Mon 10:0039
Mon 11:0038
Mon 12:0038
Mon 13:0039
Mon 14:0041
Mon 15:0044
Mon 16:0046
Mon 17:0048
Mon 18:0050
Mon 19:0050
Mon 20:0050
Mon 21:0049
Mon 22:0048
Mon 23:0049
Tue 00:0052
Tue 01:0054
Tue 02:0056
Tue 03:0058
Tue 04:00 · Now60
Tue 05:00 · Forecast64
Tue 06:00 · Forecast66
Tue 07:00 · Forecast69
Tue 08:00 · Forecast70
Tue 09:00 · Forecast69
Tue 10:00 · Forecast67
Tue 11:00 · Forecast66
Tue 12:00 · Forecast65
Tue 13:00 · Forecast64
Tue 14:00 · Forecast63
Tue 15:00 · Forecast63
Tue 16:00 · Forecast62
Tue 17:00 · Forecast63
Tue 18:00 · Forecast62
Tue 19:00 · Forecast61
Tue 20:00 · Forecast59
Tue 21:00 · Forecast56
Tue 22:00 · Forecast54
Tue 23:00 · Forecast52
Wed 00:00 · Forecast52
Wed 01:00 · Forecast51
Wed 02:00 · Forecast50
Wed 03:00 · Forecast51
Wed 04:00 · Forecast53
Wed 05:00 · Forecast55
Wed 06:00 · Forecast58
Wed 07:00 · Forecast61
Wed 08:00 · Forecast62
Wed 09:00 · Forecast61
Wed 10:00 · Forecast58
Wed 11:00 · Forecast56
Wed 12:00 · Forecast54
Wed 13:00 · Forecast53
Wed 14:00 · Forecast52
Wed 15:00 · Forecast52
Wed 16:00 · Forecast52
Wed 17:00 · Forecast52
Wed 18:00 · Forecast52
Wed 19:00 · Forecast52
Wed 20:00 · Forecast53
Wed 21:00 · Forecast53
Wed 22:00 · Forecast54
Wed 23:00 · Forecast55

Pollutants this hour

  • PM2.5 15.2 µg/m³ 24-hour mean 8.9 µg/m³ · within WHO’s 24-hour guideline (15) 60
  • PM10 19 µg/m³ 16
  • O₃ 64 µg/m³ 40
  • NO₂ 24 µg/m³ 11
  • SO₂ 2 µg/m³ 0
  • CO 0.29 mg/m³ 14

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 United States 69
Mexicali Baja California 65
Los Angeles United States 88
Phoenix United States 70
Hermosillo Sonora 16
San Jose United States 59
San Francisco United States 55

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 Tijuana’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 Tijuana right now?
60 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 Tijuana 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 Tijuana get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 50 around 02:00 to 70 around 08:00 (3 Nov). Forecasts beyond a day are less certain.

How does Tijuana compare with other cities?
Right now it is the 495th most polluted of 849 cities we track worldwide, and 9th of 22 in Mexico, all on the same US EPA scale.

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