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Air quality · Mexico

San Luis Potosí Air Quality Index (AQI) today

Modelled estimate for 07:00 local time (UTC-6), refreshed 3 Nov, 07:52 UTC+0.

56 Moderate

Live estimate · modelled

US EPA AQI07:00 UTC-6, 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 27 around 12:00 to 56 around 08:00 (3 Nov).

559th most polluted of 849 cities worldwide right now, 10th 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

08:00 · 74 09:00 · 63 10:00 · 55 11:00 · 46 12:00 · 37 13:00 · 31 14:00 · 35 15:00 · 39 16:00 · 41 17:00 · 43 18:00 · 43 19:00 · 42 20:00 · 44 21:00 · 52 22:00 · 54 23:00 · 55 00:00 · 56 01:00 · 57 02:00 · 57 03:00 · 57 04:00 · 57 05:00 · 56 06:00 · 56 07:00 · 56 08:00 · 56 09:00 · 51 10:00 · 39 11:00 · 33 12:00 · 27 13:00 · 32 14:00 · 37 15:00 · 42 16:00 · 44 17:00 · 45 18:00 · 46 19:00 · 44 20:00 · 43 21:00 · 48 22:00 · 52 23:00 · 54 00:00 · 55 01:00 · 56 02:00 · 56 03:00 · 54 04:00 · 52 05:00 · 46 06:00 · 38 07:00 · 33 08:00 · 33 09:00 · 35 10:00 · 36 11:00 · 37 12:00 · 38 13:00 · 39 14:00 · 39 15:00 · 39 16:00 · 40 17:00 · 40 18:00 · 39 19:00 · 38 20:00 · 35 21:00 · 32 22:00 · 35 23:00 · 39 00:00 · 43 01:00 · 47 Now

US EPA AQI per hour, UTC-6. 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 08:0074
Mon 09:0063
Mon 10:0055
Mon 11:0046
Mon 12:0037
Mon 13:0031
Mon 14:0035
Mon 15:0039
Mon 16:0041
Mon 17:0043
Mon 18:0043
Mon 19:0042
Mon 20:0044
Mon 21:0052
Mon 22:0054
Mon 23:0055
Tue 00:0056
Tue 01:0057
Tue 02:0057
Tue 03:0057
Tue 04:0057
Tue 05:0056
Tue 06:0056
Tue 07:00 · Now56
Tue 08:00 · Forecast56
Tue 09:00 · Forecast51
Tue 10:00 · Forecast39
Tue 11:00 · Forecast33
Tue 12:00 · Forecast27
Tue 13:00 · Forecast32
Tue 14:00 · Forecast37
Tue 15:00 · Forecast42
Tue 16:00 · Forecast44
Tue 17:00 · Forecast45
Tue 18:00 · Forecast46
Tue 19:00 · Forecast44
Tue 20:00 · Forecast43
Tue 21:00 · Forecast48
Tue 22:00 · Forecast52
Tue 23:00 · Forecast54
Wed 00:00 · Forecast55
Wed 01:00 · Forecast56
Wed 02:00 · Forecast56
Wed 03:00 · Forecast54
Wed 04:00 · Forecast52
Wed 05:00 · Forecast46
Wed 06:00 · Forecast38
Wed 07:00 · Forecast33
Wed 08:00 · Forecast33
Wed 09:00 · Forecast35
Wed 10:00 · Forecast36
Wed 11:00 · Forecast37
Wed 12:00 · Forecast38
Wed 13:00 · Forecast39
Wed 14:00 · Forecast39
Wed 15:00 · Forecast39
Wed 16:00 · Forecast40
Wed 17:00 · Forecast40
Wed 18:00 · Forecast39
Wed 19:00 · Forecast38
Wed 20:00 · Forecast35
Wed 21:00 · Forecast32
Wed 22:00 · Forecast35
Wed 23:00 · Forecast39
Thu 00:00 · Forecast43
Thu 01:00 · Forecast47

Pollutants this hour

  • PM2.5 12.2 µg/m³ 24-hour mean 9.4 µg/m³ · within WHO’s 24-hour guideline (15) 56
  • PM10 13 µg/m³ 11
  • O₃ 33 µg/m³ 9
  • NO₂ 23 µg/m³ 11
  • SO₂ 3 µg/m³ 1
  • CO 0.43 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
León Guanajuato 46
Aguascalientes Aguascalientes 63
Querétaro Querétaro 92
Morelia Michoacán 80
Zapopan Jalisco 74
Ecatepec de Morelos México 132
Mexico City Mexico City 132

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 San Luis Potosí’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 San Luis Potosí right now?
56 on the US EPA scale (Moderate) at 07:00 UTC-6, 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 San Luis Potosí 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 San Luis Potosí get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 27 around 12:00 to 56 around 08:00 (3 Nov). Forecasts beyond a day are less certain.

How does San Luis Potosí compare with other cities?
Right now it is the 559th most polluted of 849 cities we track worldwide, and 10th of 22 in Mexico, all on the same US EPA scale.

Why does another app show a different AQI for San Luis Potosí?
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.