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Air quality · Alborz Province, Iran

Karaj Air Quality Index (AQI) today

Modelled estimate for 15:30 local time (UTC+3:30), refreshed 3 Nov, 07:52 UTC+0.

41 Good

Live estimate · modelled

US EPA AQI15:30 UTC+3:30, 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 61.

Over the next 24 hours the model expects the AQI to range from 49 around 16:30 to 104 around 08:30 (4 Nov).

702nd most polluted of 849 cities worldwide right now, 9th of 9 in Iran.

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

16:30 · 43 17:30 · 44 18:30 · 46 19:30 · 49 20:30 · 54 21:30 · 56 22:30 · 56 23:30 · 57 00:30 · 57 01:30 · 61 02:30 · 62 03:30 · 65 04:30 · 68 05:30 · 74 06:30 · 87 07:30 · 113 08:30 · 90 09:30 · 71 10:30 · 59 11:30 · 53 12:30 · 46 13:30 · 41 14:30 · 39 15:30 · 41 16:30 · 49 17:30 · 56 18:30 · 60 19:30 · 71 20:30 · 84 21:30 · 90 22:30 · 89 23:30 · 87 00:30 · 83 01:30 · 78 02:30 · 71 03:30 · 66 04:30 · 61 05:30 · 60 06:30 · 67 07:30 · 84 08:30 · 104 09:30 · 80 10:30 · 66 11:30 · 58 12:30 · 53 13:30 · 52 14:30 · 52 15:30 · 54 16:30 · 56 17:30 · 61 18:30 · 70 19:30 · 76 20:30 · 78 21:30 · 77 22:30 · 75 23:30 · 77 00:30 · 76 01:30 · 72 02:30 · 68 03:30 · 63 04:30 · 60 05:30 · 59 06:30 · 65 07:30 · 81 08:30 · 75 09:30 · 67 10:30 · 63 Now

US EPA AQI per hour, UTC+3:30. 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 16:3043
Mon 17:3044
Mon 18:3046
Mon 19:3049
Mon 20:3054
Mon 21:3056
Mon 22:3056
Mon 23:3057
Tue 00:3057
Tue 01:3061
Tue 02:3062
Tue 03:3065
Tue 04:3068
Tue 05:3074
Tue 06:3087
Tue 07:30113
Tue 08:3090
Tue 09:3071
Tue 10:3059
Tue 11:3053
Tue 12:3046
Tue 13:3041
Tue 14:3039
Tue 15:30 · Now41
Tue 16:30 · Forecast49
Tue 17:30 · Forecast56
Tue 18:30 · Forecast60
Tue 19:30 · Forecast71
Tue 20:30 · Forecast84
Tue 21:30 · Forecast90
Tue 22:30 · Forecast89
Tue 23:30 · Forecast87
Wed 00:30 · Forecast83
Wed 01:30 · Forecast78
Wed 02:30 · Forecast71
Wed 03:30 · Forecast66
Wed 04:30 · Forecast61
Wed 05:30 · Forecast60
Wed 06:30 · Forecast67
Wed 07:30 · Forecast84
Wed 08:30 · Forecast104
Wed 09:30 · Forecast80
Wed 10:30 · Forecast66
Wed 11:30 · Forecast58
Wed 12:30 · Forecast53
Wed 13:30 · Forecast52
Wed 14:30 · Forecast52
Wed 15:30 · Forecast54
Wed 16:30 · Forecast56
Wed 17:30 · Forecast61
Wed 18:30 · Forecast70
Wed 19:30 · Forecast76
Wed 20:30 · Forecast78
Wed 21:30 · Forecast77
Wed 22:30 · Forecast75
Wed 23:30 · Forecast77
Thu 00:30 · Forecast76
Thu 01:30 · Forecast72
Thu 02:30 · Forecast68
Thu 03:30 · Forecast63
Thu 04:30 · Forecast60
Thu 05:30 · Forecast59
Thu 06:30 · Forecast65
Thu 07:30 · Forecast81
Thu 08:30 · Forecast75
Thu 09:30 · Forecast67
Thu 10:30 · Forecast63

Pollutants this hour

  • PM2.5 7.6 µg/m³ 24-hour mean 14.6 µg/m³ · within WHO’s 24-hour guideline (15) 41
  • PM10 12 µg/m³ 10
  • O₃ 95 µg/m³ 41
  • NO₂ 14 µg/m³ 7
  • SO₂ 5 µg/m³ 1
  • CO 0.35 mg/m³ 5

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
Tehran Tehran 64
Qom Qom Province 59
Isfahan Isfahan 67
Kermanshah Kermanshah Province 55
Tabriz East Azerbaijan 52
Sulaymaniyah Iraq 58
Baku Azerbaijan 81

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 Karaj’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 Karaj right now?
41 on the US EPA scale (Good) at 15:30 UTC+3:30, 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 Karaj 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 Karaj get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 49 around 16:30 to 104 around 08:30 (4 Nov). Forecasts beyond a day are less certain.

How does Karaj compare with other cities?
Right now it is the 702nd most polluted of 849 cities we track worldwide, and 9th of 9 in Iran, all on the same US EPA scale.

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