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Air quality · Coahuila, Mexico

Saltillo Air Quality Index (AQI) today

Modelled estimate for 06:00 local time (UTC-6), refreshed 3 Nov, 07:52 UTC+0.

43 Good

Live estimate · modelled

US EPA AQI06:00 UTC-6, 3 Nov Main pollutant: PM2.5

Air quality is satisfactory, and air pollution poses little or no risk.

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 55.

Over the next 24 hours the model expects the AQI to range from 33 around 23:00 to 49 around 18:00 (3 Nov).

692nd most polluted of 849 cities worldwide right now, 17th of 22 in Mexico.

What to do today

  • Long walk or run outside OK
  • Kids playing outside OK
  • Airing the house Open
  • Mask outdoors Not needed

Based on the US EPA’s health statement: “Air quality is satisfactory, and air pollution poses little or no risk.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

07:00 · 57 08:00 · 55 09:00 · 54 10:00 · 51 11:00 · 42 12:00 · 35 13:00 · 31 14:00 · 31 15:00 · 36 16:00 · 41 17:00 · 44 18:00 · 44 19:00 · 55 20:00 · 62 21:00 · 67 22:00 · 70 23:00 · 71 00:00 · 72 01:00 · 70 02:00 · 66 03:00 · 61 04:00 · 56 05:00 · 52 06:00 · 43 07:00 · 38 08:00 · 39 09:00 · 39 10:00 · 43 11:00 · 46 12:00 · 47 13:00 · 46 14:00 · 43 15:00 · 44 16:00 · 46 17:00 · 48 18:00 · 49 19:00 · 47 20:00 · 44 21:00 · 41 22:00 · 37 23:00 · 33 00:00 · 34 01:00 · 35 02:00 · 37 03:00 · 40 04:00 · 43 05:00 · 46 06:00 · 48 07:00 · 51 08:00 · 51 09:00 · 44 10:00 · 32 11:00 · 27 12:00 · 26 13:00 · 29 14:00 · 33 15:00 · 38 16:00 · 42 17:00 · 45 18:00 · 51 19:00 · 56 20:00 · 59 21:00 · 61 22:00 · 62 23:00 · 61 00:00 · 60 01:00 · 58 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 07:0057
Mon 08:0055
Mon 09:0054
Mon 10:0051
Mon 11:0042
Mon 12:0035
Mon 13:0031
Mon 14:0031
Mon 15:0036
Mon 16:0041
Mon 17:0044
Mon 18:0044
Mon 19:0055
Mon 20:0062
Mon 21:0067
Mon 22:0070
Mon 23:0071
Tue 00:0072
Tue 01:0070
Tue 02:0066
Tue 03:0061
Tue 04:0056
Tue 05:0052
Tue 06:00 · Now43
Tue 07:00 · Forecast38
Tue 08:00 · Forecast39
Tue 09:00 · Forecast39
Tue 10:00 · Forecast43
Tue 11:00 · Forecast46
Tue 12:00 · Forecast47
Tue 13:00 · Forecast46
Tue 14:00 · Forecast43
Tue 15:00 · Forecast44
Tue 16:00 · Forecast46
Tue 17:00 · Forecast48
Tue 18:00 · Forecast49
Tue 19:00 · Forecast47
Tue 20:00 · Forecast44
Tue 21:00 · Forecast41
Tue 22:00 · Forecast37
Tue 23:00 · Forecast33
Wed 00:00 · Forecast34
Wed 01:00 · Forecast35
Wed 02:00 · Forecast37
Wed 03:00 · Forecast40
Wed 04:00 · Forecast43
Wed 05:00 · Forecast46
Wed 06:00 · Forecast48
Wed 07:00 · Forecast51
Wed 08:00 · Forecast51
Wed 09:00 · Forecast44
Wed 10:00 · Forecast32
Wed 11:00 · Forecast27
Wed 12:00 · Forecast26
Wed 13:00 · Forecast29
Wed 14:00 · Forecast33
Wed 15:00 · Forecast38
Wed 16:00 · Forecast42
Wed 17:00 · Forecast45
Wed 18:00 · Forecast51
Wed 19:00 · Forecast56
Wed 20:00 · Forecast59
Wed 21:00 · Forecast61
Wed 22:00 · Forecast62
Wed 23:00 · Forecast61
Thu 00:00 · Forecast60
Thu 01:00 · Forecast58

Pollutants this hour

  • PM2.5 5.9 µg/m³ 24-hour mean 11.2 µg/m³ · within WHO’s 24-hour guideline (15) 43
  • PM10 6 µg/m³ 6
  • O₃ 34 µg/m³ 7
  • NO₂ 24 µg/m³ 11
  • SO₂ 3 µg/m³ 1
  • CO 0.20 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
Monterrey Nuevo León 55
Torreón Coahuila 19
San Luis Potosí San Luis Potosí 56
Aguascalientes Aguascalientes 62
León Guanajuato 44
San Antonio United States 19
Querétaro Querétaro 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 Saltillo’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 Saltillo right now?
43 on the US EPA scale (Good) at 06:00 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 Saltillo today?
For most people, yes. The EPA’s statement for “Good”: Air quality is satisfactory, and air pollution poses little or no risk. General guidance, not medical advice.

Will the air in Saltillo get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 33 around 23:00 to 49 around 18:00 (3 Nov). Forecasts beyond a day are less certain.

How does Saltillo compare with other cities?
Right now it is the 692nd most polluted of 849 cities we track worldwide, and 17th of 22 in Mexico, all on the same US EPA scale.

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