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Air quality · Yucatán, Mexico

Mérida 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 54.

Over the next 24 hours the model expects the AQI to range from 28 around 04:00 to 54 around 08:00 (3 Nov).

594th most polluted of 849 cities worldwide right now, 12th 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 · 58 09:00 · 55 10:00 · 53 11:00 · 49 12:00 · 45 13:00 · 44 14:00 · 47 15:00 · 47 16:00 · 48 17:00 · 53 18:00 · 57 19:00 · 58 20:00 · 58 21:00 · 58 22:00 · 58 23:00 · 58 00:00 · 57 01:00 · 56 02:00 · 55 03:00 · 55 04:00 · 55 05:00 · 55 06:00 · 54 07:00 · 54 08:00 · 54 09:00 · 53 10:00 · 49 11:00 · 39 12:00 · 34 13:00 · 35 14:00 · 41 15:00 · 44 16:00 · 45 17:00 · 47 18:00 · 54 19:00 · 54 20:00 · 52 21:00 · 49 22:00 · 44 23:00 · 40 00:00 · 36 01:00 · 33 02:00 · 31 03:00 · 29 04:00 · 28 05:00 · 29 06:00 · 34 07:00 · 41 08:00 · 44 09:00 · 43 10:00 · 40 11:00 · 37 12:00 · 35 13:00 · 35 14:00 · 39 15:00 · 43 16:00 · 44 17:00 · 44 18:00 · 51 19:00 · 53 20:00 · 53 21:00 · 52 22:00 · 49 23:00 · 46 00:00 · 43 01:00 · 40 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 08:0058
Mon 09:0055
Mon 10:0053
Mon 11:0049
Mon 12:0045
Mon 13:0044
Mon 14:0047
Mon 15:0047
Mon 16:0048
Mon 17:0053
Mon 18:0057
Mon 19:0058
Mon 20:0058
Mon 21:0058
Mon 22:0058
Mon 23:0058
Tue 00:0057
Tue 01:0056
Tue 02:0055
Tue 03:0055
Tue 04:0055
Tue 05:0055
Tue 06:0054
Tue 07:00 · Now54
Tue 08:00 · Forecast54
Tue 09:00 · Forecast53
Tue 10:00 · Forecast49
Tue 11:00 · Forecast39
Tue 12:00 · Forecast34
Tue 13:00 · Forecast35
Tue 14:00 · Forecast41
Tue 15:00 · Forecast44
Tue 16:00 · Forecast45
Tue 17:00 · Forecast47
Tue 18:00 · Forecast54
Tue 19:00 · Forecast54
Tue 20:00 · Forecast52
Tue 21:00 · Forecast49
Tue 22:00 · Forecast44
Tue 23:00 · Forecast40
Wed 00:00 · Forecast36
Wed 01:00 · Forecast33
Wed 02:00 · Forecast31
Wed 03:00 · Forecast29
Wed 04:00 · Forecast28
Wed 05:00 · Forecast29
Wed 06:00 · Forecast34
Wed 07:00 · Forecast41
Wed 08:00 · Forecast44
Wed 09:00 · Forecast43
Wed 10:00 · Forecast40
Wed 11:00 · Forecast37
Wed 12:00 · Forecast35
Wed 13:00 · Forecast35
Wed 14:00 · Forecast39
Wed 15:00 · Forecast43
Wed 16:00 · Forecast44
Wed 17:00 · Forecast44
Wed 18:00 · Forecast51
Wed 19:00 · Forecast53
Wed 20:00 · Forecast53
Wed 21:00 · Forecast52
Wed 22:00 · Forecast49
Wed 23:00 · Forecast46
Thu 00:00 · Forecast43
Thu 01:00 · Forecast40

Pollutants this hour

  • PM2.5 10.4 µg/m³ 24-hour mean 10.7 µg/m³ · within WHO’s 24-hour guideline (15) 54
  • PM10 11 µg/m³ 10
  • O₃ 37 µg/m³ 8
  • NO₂ 13 µg/m³ 6
  • SO₂ 3 µg/m³ 1
  • CO 0.34 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
Cancún Quintana Roo 32
Tuxtla Chiapas 53
San Pedro Sula Honduras 70
Guatemala City Guatemala 63
Havana Cuba 21
Tegucigalpa Honduras 34
San Salvador El Salvador 56

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 Mérida’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 Mérida 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 Mérida 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 Mérida get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 28 around 04:00 to 54 around 08:00 (3 Nov). Forecasts beyond a day are less certain.

How does Mérida compare with other cities?
Right now it is the 594th most polluted of 849 cities we track worldwide, and 12th of 22 in Mexico, all on the same US EPA scale.

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