Is the air in Monterrey safe today?

Yes. Right now the US AQI in Monterrey is 40, which counts as good. Great air. A perfect time to be outside. It is expected to reach 56 (moderate) around Fri 18:00.

When is the best time to be outside in Monterrey?

Fri 11:00–14:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 43. The worst hour is around Fri 18:00, at 56.

What is the main pollutant in Monterrey?

Fine particles (PM2.5). It drives the index right now, at 7.2 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.

How does Monterrey's air compare with the WHO guideline?

Within the guideline. Over the next 24 hours PM2.5 averages about 9.3 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. The other pollutants stay within their guideline levels.

How many cigarettes is a day of Monterrey's air?

About 0.4 cigarettes. Over the next 24 hours PM2.5 averages about 9.3 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.

Will air quality in Monterrey improve this week?

Tuesday looks cleanest. Its AQI peaks at 49, against 97 on Sunday, the worst day in the forecast.

Monterrey air quality

Nuevo León, Mexico · Live AQI and hourly forecast for the next 5 days · valid Fri 11:00 local time

Good

US AQI, mostly PM_2.5

Model estimate. Nearby measurements are shown separately.

Great air. A perfect time to be outside.

Next 24 hours: 40–56US AQI, highest around Fri 18:00
Best time outside: Fri 11:00–14:00US AQI about 43
PM_2.5 vs WHO guideline: 0.6×9.3 µg/m³ over 24 h, guideline 15
Cigarette equivalent: ≈ 0.4 a dayBerkeley Earth rule of thumb

Loading the live globe…

The live globe, centred on Monterrey. Switch pollutants, drag through the next 5 days or press play. Full map →

Pollutants in Monterrey right now

Pollutant	Now	Level	Next 24 h vs WHO
Fine particles PM_2.5	7.2 µg/m³	Good	0.6×
Coarse particles PM₁₀	7.5 µg/m³	Good	0.2×
Nitrogen dioxide NO₂	11 µg/m³	Good	0.5×
Ozone O₃	79 µg/m³	Good	1.0×
Sulphur dioxide SO₂	8.3 µg/m³	Good	0.1×
Carbon monoxide CO	583 µg/m³	Good	0.1×
Aerosol optical depth	0.13	Whole atmosphere · dimensionless
Desert dust	0 µg/m³	Modelled surface dust
UV index	5	Moderate

“Next 24 h vs WHO” compares the forecast with the World Health Organization’s 2021 guideline levels: 24-hour means of 15 µg/m³ for PM_2.5, 45 for PM₁₀, 25 for NO₂, 40 for SO₂ and 4 mg/m³ for CO, and 100 µg/m³ over 8 hours for ozone. Above 1× is above the guideline. Levels follow the US AQI, which is far less strict than the WHO, so air rated Good can still be above a guideline.

Next 48 hours

Hourly US AQI. Highest 67 around Sat 20:00, lowest 36 around Sun 10:00.

Good 0–50Moderate 51–100Sensitive 101–150Unhealthy 151–200Very unhealthy 201–300Hazardous 301+

5-day air quality forecast for Monterrey

Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 150.

Day	US AQI	At worst	Worst hour	PM_2.5 avg	UV max
Fri 13 Nov	40–91	Moderate	8:00	14	5 Moderate
Sat 14 Nov	37–67	Moderate	20:00	10.0	6 High
Sun 15 Nov	36–97	Moderate	22:00	14	6 High
Mon 16 Nov	20–86	Moderate	0:00	9.8	2 Low
Tue 17 Nov	25–49	Good	18:00	5.6	3 Moderate

Common questions about the air in Monterrey

Is the air in Monterrey safe today?
Yes. Right now the US AQI in Monterrey is 40, which counts as good. Great air. A perfect time to be outside. It is expected to reach 56 (moderate) around Fri 18:00.
When is the best time to be outside in Monterrey?
Fri 11:00–14:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 43. The worst hour is around Fri 18:00, at 56.
What is the main pollutant in Monterrey?
Fine particles (PM_2.5). It drives the index right now, at 7.2 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.
How does Monterrey's air compare with the WHO guideline?
Within the guideline. Over the next 24 hours PM_2.5 averages about 9.3 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. The other pollutants stay within their guideline levels.
How many cigarettes is a day of Monterrey's air?
About 0.4 cigarettes. Over the next 24 hours PM_2.5 averages about 9.3 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.
Will air quality in Monterrey improve this week?
Tuesday looks cleanest. Its AQI peaks at 49, against 97 on Sunday, the worst day in the forecast.

Measured near Monterrey

Station and measurements	Distance	US AQI	Level
Unnamed sensor OpenAQ, low-cost sensor PM_2.5: 44 µg/m³ · Fri 11:00	1.3 km	122	Sensitive
Unnamed sensor OpenAQ, low-cost sensor PM_2.5: 8.2 µg/m³ · Fri 11:00	12 km	46	Good
Unnamed sensor Sensor.Community, low-cost sensor PM_2.5: 0.7 µg/m³ · Fri 11:37 PM₁₀: 0.9 µg/m³ · Fri 11:37	13 km	4	Good

Air quality near Monterrey

US AQI right now. Cleanest nearby: Dallas (26); worst: Mexico City (66). The tick on each bar is Monterrey, at 40.

Guadalajara 639 km SW 54 Moderate
Houston 665 km NE 61 Moderate
Mexico City 706 km S 66 Moderate
Dallas 859 km NE 26 Good
Phoenix 1,426 km NW 53 Moderate
Denver 1,622 km N 46 Good

All 162 cities →

About this forecast

Forecast from CAMS global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (about 10 km inside Europe). Global runs update every 12 hours and European runs every 24 hours. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown. Nearby station measurements are independent observations, not adjustments to the forecast. The point forecast uses Open-Meteo’s CAMS products, including a separate carbon monoxide product; it can differ from the globe’s global grid. The AQI rates each hour on the US EPA scale, the same way the map colors it; official daily figures average over 24 hours (8 for ozone), so they can read lower after a short peak. Readings for 25.69°N, 100.32°W, valid 2026-11-13 17:00 UTC.