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Air quality · North Sumatra, Indonesia

Medan Air Quality Index (AQI) today

Modelled estimate for 20:00 local time (UTC+7), refreshed 3 Nov, 07:52 UTC+0.

115 Unhealthy for sensitive groups

Live estimate · modelled

US EPA AQI20:00 UTC+7, 3 Nov Main pollutant: O₃

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

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 91.

Over the next 24 hours the model expects the AQI to range from 66 around 14:00 to 154 around 07:00 (4 Nov).

159th most polluted of 849 cities worldwide right now, 10th of 25 in Indonesia.

What to do today

  • Long walk or run outside Shorter if you have asthma or heart disease
  • Kids playing outside OK, less for kids with asthma
  • Airing the house Open
  • Mask outdoors If you are in a sensitive group

Based on the US EPA’s health statement: “Members of sensitive groups may experience health effects. The general public is less likely to be affected.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

21:00 · 155 22:00 · 162 23:00 · 156 00:00 · 118 01:00 · 96 02:00 · 88 03:00 · 81 04:00 · 78 05:00 · 78 06:00 · 81 07:00 · 89 08:00 · 96 09:00 · 86 10:00 · 79 11:00 · 76 12:00 · 75 13:00 · 74 14:00 · 100 15:00 · 136 16:00 · 159 17:00 · 164 18:00 · 159 19:00 · 143 20:00 · 115 21:00 · 109 22:00 · 115 23:00 · 124 00:00 · 138 01:00 · 149 02:00 · 151 03:00 · 152 04:00 · 150 05:00 · 148 06:00 · 152 07:00 · 154 08:00 · 136 09:00 · 101 10:00 · 85 11:00 · 77 12:00 · 71 13:00 · 68 14:00 · 66 15:00 · 74 16:00 · 93 17:00 · 100 18:00 · 97 19:00 · 88 20:00 · 108 21:00 · 122 22:00 · 132 23:00 · 150 00:00 · 133 01:00 · 98 02:00 · 85 03:00 · 80 04:00 · 79 05:00 · 82 06:00 · 90 07:00 · 104 08:00 · 100 09:00 · 88 10:00 · 78 11:00 · 71 12:00 · 68 13:00 · 66 14:00 · 71 Now

US EPA AQI per hour, UTC+7. 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 21:00155
Mon 22:00162
Mon 23:00156
Tue 00:00118
Tue 01:0096
Tue 02:0088
Tue 03:0081
Tue 04:0078
Tue 05:0078
Tue 06:0081
Tue 07:0089
Tue 08:0096
Tue 09:0086
Tue 10:0079
Tue 11:0076
Tue 12:0075
Tue 13:0074
Tue 14:00100
Tue 15:00136
Tue 16:00159
Tue 17:00164
Tue 18:00159
Tue 19:00143
Tue 20:00 · Now115
Tue 21:00 · Forecast109
Tue 22:00 · Forecast115
Tue 23:00 · Forecast124
Wed 00:00 · Forecast138
Wed 01:00 · Forecast149
Wed 02:00 · Forecast151
Wed 03:00 · Forecast152
Wed 04:00 · Forecast150
Wed 05:00 · Forecast148
Wed 06:00 · Forecast152
Wed 07:00 · Forecast154
Wed 08:00 · Forecast136
Wed 09:00 · Forecast101
Wed 10:00 · Forecast85
Wed 11:00 · Forecast77
Wed 12:00 · Forecast71
Wed 13:00 · Forecast68
Wed 14:00 · Forecast66
Wed 15:00 · Forecast74
Wed 16:00 · Forecast93
Wed 17:00 · Forecast100
Wed 18:00 · Forecast97
Wed 19:00 · Forecast88
Wed 20:00 · Forecast108
Wed 21:00 · Forecast122
Wed 22:00 · Forecast132
Wed 23:00 · Forecast150
Thu 00:00 · Forecast133
Thu 01:00 · Forecast98
Thu 02:00 · Forecast85
Thu 03:00 · Forecast80
Thu 04:00 · Forecast79
Thu 05:00 · Forecast82
Thu 06:00 · Forecast90
Thu 07:00 · Forecast104
Thu 08:00 · Forecast100
Thu 09:00 · Forecast88
Thu 10:00 · Forecast78
Thu 11:00 · Forecast71
Thu 12:00 · Forecast68
Thu 13:00 · Forecast66
Thu 14:00 · Forecast71

Pollutants this hour

  • PM2.5 43.0 µg/m³ 24-hour mean 30.6 µg/m³ · 2.0× WHO’s 24-hour guideline (15) 107
  • PM10 43 µg/m³ 35
  • O₃ 72 µg/m³ 115
  • NO₂ 47 µg/m³ 23
  • SO₂ 17 µg/m³ 9
  • CO 3.67 mg/m³ 17

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
Ipoh Malaysia 88
Kuala Lumpur Malaysia 153
Pekanbaru Riau 61
Padang West Sumatra 92
Johor Bahru Malaysia 116
Singapore Singapore 108
Batam Riau 108

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 Medan’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 Medan right now?
115 on the US EPA scale (Unhealthy for sensitive groups) at 20:00 UTC+7, 3 Nov. O₃ 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 Medan today?
For most people, yes; people with asthma, heart or lung disease, older adults and children should take it easier. The EPA’s statement for “Unhealthy for sensitive groups”: Members of sensitive groups may experience health effects. The general public is less likely to be affected. General guidance, not medical advice.

Will the air in Medan get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 66 around 14:00 to 154 around 07:00 (4 Nov). Forecasts beyond a day are less certain.

How does Medan compare with other cities?
Right now it is the 159th most polluted of 849 cities we track worldwide, and 10th of 25 in Indonesia, all on the same US EPA scale.

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