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Air quality · Nuevo León, Mexico

Monterrey Air Quality Index (AQI) today

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

54 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 63.

Over the next 24 hours the model expects the AQI to range from 36 around 23:00 to 60 around 09:00 (3 Nov).

595th most polluted of 849 cities worldwide right now, 13th 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 · 55 09:00 · 53 10:00 · 50 11:00 · 46 12:00 · 46 13:00 · 47 14:00 · 50 15:00 · 52 16:00 · 54 17:00 · 64 18:00 · 77 19:00 · 80 20:00 · 77 21:00 · 81 22:00 · 82 23:00 · 82 00:00 · 80 01:00 · 76 02:00 · 71 03:00 · 66 04:00 · 62 05:00 · 58 06:00 · 55 07:00 · 54 08:00 · 57 09:00 · 60 10:00 · 60 11:00 · 59 12:00 · 58 13:00 · 56 14:00 · 55 15:00 · 53 16:00 · 52 17:00 · 54 18:00 · 54 19:00 · 50 20:00 · 45 21:00 · 42 22:00 · 37 23:00 · 36 00:00 · 38 01:00 · 41 02:00 · 43 03:00 · 46 04:00 · 47 05:00 · 47 06:00 · 48 07:00 · 52 08:00 · 52 09:00 · 49 10:00 · 36 11:00 · 29 12:00 · 28 13:00 · 30 14:00 · 33 15:00 · 38 16:00 · 43 17:00 · 46 18:00 · 53 19:00 · 59 20:00 · 62 21:00 · 63 22:00 · 61 23:00 · 58 00:00 · 54 01:00 · 52 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 08:0055
Mon 09:0053
Mon 10:0050
Mon 11:0046
Mon 12:0046
Mon 13:0047
Mon 14:0050
Mon 15:0052
Mon 16:0054
Mon 17:0064
Mon 18:0077
Mon 19:0080
Mon 20:0077
Mon 21:0081
Mon 22:0082
Mon 23:0082
Tue 00:0080
Tue 01:0076
Tue 02:0071
Tue 03:0066
Tue 04:0062
Tue 05:0058
Tue 06:0055
Tue 07:00 · Now54
Tue 08:00 · Forecast57
Tue 09:00 · Forecast60
Tue 10:00 · Forecast60
Tue 11:00 · Forecast59
Tue 12:00 · Forecast58
Tue 13:00 · Forecast56
Tue 14:00 · Forecast55
Tue 15:00 · Forecast53
Tue 16:00 · Forecast52
Tue 17:00 · Forecast54
Tue 18:00 · Forecast54
Tue 19:00 · Forecast50
Tue 20:00 · Forecast45
Tue 21:00 · Forecast42
Tue 22:00 · Forecast37
Tue 23:00 · Forecast36
Wed 00:00 · Forecast38
Wed 01:00 · Forecast41
Wed 02:00 · Forecast43
Wed 03:00 · Forecast46
Wed 04:00 · Forecast47
Wed 05:00 · Forecast47
Wed 06:00 · Forecast48
Wed 07:00 · Forecast52
Wed 08:00 · Forecast52
Wed 09:00 · Forecast49
Wed 10:00 · Forecast36
Wed 11:00 · Forecast29
Wed 12:00 · Forecast28
Wed 13:00 · Forecast30
Wed 14:00 · Forecast33
Wed 15:00 · Forecast38
Wed 16:00 · Forecast43
Wed 17:00 · Forecast46
Wed 18:00 · Forecast53
Wed 19:00 · Forecast59
Wed 20:00 · Forecast62
Wed 21:00 · Forecast63
Wed 22:00 · Forecast61
Wed 23:00 · Forecast58
Thu 00:00 · Forecast54
Thu 01:00 · Forecast52

Pollutants this hour

  • PM2.5 10.7 µg/m³ 24-hour mean 15.4 µg/m³ · 1.0× WHO’s 24-hour guideline (15) 54
  • PM10 11 µg/m³ 10
  • O₃ 49 µg/m³ 15
  • NO₂ 23 µg/m³ 11
  • SO₂ 8 µg/m³ 4
  • CO 0.92 mg/m³ 15

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
Saltillo Coahuila 38
Torreón Coahuila 17
San Luis Potosí San Luis Potosí 56
San Antonio United States 18
Aguascalientes Aguascalientes 63
León Guanajuato 46
Querétaro Querétaro 92

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 Monterrey’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 Monterrey right now?
54 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 Monterrey 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 Monterrey get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 36 around 23:00 to 60 around 09:00 (3 Nov). Forecasts beyond a day are less certain.

How does Monterrey compare with other cities?
Right now it is the 595th most polluted of 849 cities we track worldwide, and 13th of 22 in Mexico, all on the same US EPA scale.

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