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Air quality · Costa Rica

San José Air Quality Index (AQI) today

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

46 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 35.

Over the next 24 hours the model expects the AQI to range from 34 around 12:00 to 60 around 23:00 (3 Nov).

676th most polluted of 849 cities worldwide right now.

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 · 19 08:00 · 22 09:00 · 22 10:00 · 18 11:00 · 18 12:00 · 20 13:00 · 29 14:00 · 32 15:00 · 34 16:00 · 46 17:00 · 55 18:00 · 53 19:00 · 45 20:00 · 38 21:00 · 33 22:00 · 32 23:00 · 32 00:00 · 33 01:00 · 35 02:00 · 36 03:00 · 35 04:00 · 35 05:00 · 36 06:00 · 46 07:00 · 53 08:00 · 53 09:00 · 52 10:00 · 47 11:00 · 37 12:00 · 34 13:00 · 35 14:00 · 36 15:00 · 42 16:00 · 50 17:00 · 53 18:00 · 51 19:00 · 48 20:00 · 49 21:00 · 54 22:00 · 57 23:00 · 60 00:00 · 60 01:00 · 58 02:00 · 56 03:00 · 55 04:00 · 53 05:00 · 52 06:00 · 54 07:00 · 56 08:00 · 53 09:00 · 47 10:00 · 39 11:00 · 33 12:00 · 35 13:00 · 34 14:00 · 38 15:00 · 38 16:00 · 39 17:00 · 41 18:00 · 50 19:00 · 49 20:00 · 43 21:00 · 38 22:00 · 35 23:00 · 32 00:00 · 28 01:00 · 24 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 07:0019
Mon 08:0022
Mon 09:0022
Mon 10:0018
Mon 11:0018
Mon 12:0020
Mon 13:0029
Mon 14:0032
Mon 15:0034
Mon 16:0046
Mon 17:0055
Mon 18:0053
Mon 19:0045
Mon 20:0038
Mon 21:0033
Mon 22:0032
Mon 23:0032
Tue 00:0033
Tue 01:0035
Tue 02:0036
Tue 03:0035
Tue 04:0035
Tue 05:0036
Tue 06:00 · Now46
Tue 07:00 · Forecast53
Tue 08:00 · Forecast53
Tue 09:00 · Forecast52
Tue 10:00 · Forecast47
Tue 11:00 · Forecast37
Tue 12:00 · Forecast34
Tue 13:00 · Forecast35
Tue 14:00 · Forecast36
Tue 15:00 · Forecast42
Tue 16:00 · Forecast50
Tue 17:00 · Forecast53
Tue 18:00 · Forecast51
Tue 19:00 · Forecast48
Tue 20:00 · Forecast49
Tue 21:00 · Forecast54
Tue 22:00 · Forecast57
Tue 23:00 · Forecast60
Wed 00:00 · Forecast60
Wed 01:00 · Forecast58
Wed 02:00 · Forecast56
Wed 03:00 · Forecast55
Wed 04:00 · Forecast53
Wed 05:00 · Forecast52
Wed 06:00 · Forecast54
Wed 07:00 · Forecast56
Wed 08:00 · Forecast53
Wed 09:00 · Forecast47
Wed 10:00 · Forecast39
Wed 11:00 · Forecast33
Wed 12:00 · Forecast35
Wed 13:00 · Forecast34
Wed 14:00 · Forecast38
Wed 15:00 · Forecast38
Wed 16:00 · Forecast39
Wed 17:00 · Forecast41
Wed 18:00 · Forecast50
Wed 19:00 · Forecast49
Wed 20:00 · Forecast43
Wed 21:00 · Forecast38
Wed 22:00 · Forecast35
Wed 23:00 · Forecast32
Thu 00:00 · Forecast28
Thu 01:00 · Forecast24

Pollutants this hour

  • PM2.5 10.0 µg/m³ 24-hour mean 6.4 µg/m³ · within WHO’s 24-hour guideline (15) 46
  • PM10 10 µg/m³ 7
  • O₃ 7 µg/m³ 2
  • NO₂ 23 µg/m³ 11
  • SO₂ 7 µg/m³ 3
  • CO 0.82 mg/m³ 9

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
Managua Nicaragua 17
Panama City Panama 17
Tegucigalpa Honduras 34
San Salvador El Salvador 53
San Pedro Sula Honduras 67
Guatemala City Guatemala 62
Cartagena Colombia 39

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 José’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 José right now?
46 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 San José 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 San José get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 34 around 12:00 to 60 around 23:00 (3 Nov). Forecasts beyond a day are less certain.

How does San José compare with other cities?
Right now it is the 676th most polluted of 849 cities we track worldwide, all on the same US EPA scale.

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