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Air quality · Central Java, Indonesia

Semarang Air Quality Index (AQI) today

Modelled estimate for 19:00 local time (UTC+7), refreshed 3 Nov, 07:52 UTC+0.

159 Unhealthy

Live estimate · modelled

US EPA AQI19:00 UTC+7, 3 Nov Main pollutant: O₃

Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects.

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 105.

Over the next 24 hours the model expects the AQI to range from 85 around 08:00 to 201 around 19:00 (4 Nov).

75th most polluted of 849 cities worldwide right now, 6th of 25 in Indonesia.

What to do today

  • Long walk or run outside Shorten it, take breaks
  • Kids playing outside Limit it
  • Airing the house Open briefly
  • Mask outdoors N95 if outside for long

Based on the US EPA’s health statement: “Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

20:00 · 105 21:00 · 82 22:00 · 89 23:00 · 97 00:00 · 107 01:00 · 113 02:00 · 114 03:00 · 116 04:00 · 118 05:00 · 121 06:00 · 122 07:00 · 122 08:00 · 120 09:00 · 118 10:00 · 117 11:00 · 115 12:00 · 110 13:00 · 107 14:00 · 108 15:00 · 143 16:00 · 161 17:00 · 169 18:00 · 169 19:00 · 159 20:00 · 143 21:00 · 119 22:00 · 97 23:00 · 98 00:00 · 98 01:00 · 98 02:00 · 98 03:00 · 96 04:00 · 94 05:00 · 90 06:00 · 88 07:00 · 86 08:00 · 85 09:00 · 86 10:00 · 86 11:00 · 88 12:00 · 90 13:00 · 96 14:00 · 113 15:00 · 143 16:00 · 169 17:00 · 187 18:00 · 200 19:00 · 201 20:00 · 200 21:00 · 192 22:00 · 177 23:00 · 164 00:00 · 150 01:00 · 129 02:00 · 124 03:00 · 123 04:00 · 121 05:00 · 118 06:00 · 116 07:00 · 111 08:00 · 105 09:00 · 99 10:00 · 97 11:00 · 97 12:00 · 104 13:00 · 120 14:00 · 136 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 20:00105
Mon 21:0082
Mon 22:0089
Mon 23:0097
Tue 00:00107
Tue 01:00113
Tue 02:00114
Tue 03:00116
Tue 04:00118
Tue 05:00121
Tue 06:00122
Tue 07:00122
Tue 08:00120
Tue 09:00118
Tue 10:00117
Tue 11:00115
Tue 12:00110
Tue 13:00107
Tue 14:00108
Tue 15:00143
Tue 16:00161
Tue 17:00169
Tue 18:00169
Tue 19:00 · Now159
Tue 20:00 · Forecast143
Tue 21:00 · Forecast119
Tue 22:00 · Forecast97
Tue 23:00 · Forecast98
Wed 00:00 · Forecast98
Wed 01:00 · Forecast98
Wed 02:00 · Forecast98
Wed 03:00 · Forecast96
Wed 04:00 · Forecast94
Wed 05:00 · Forecast90
Wed 06:00 · Forecast88
Wed 07:00 · Forecast86
Wed 08:00 · Forecast85
Wed 09:00 · Forecast86
Wed 10:00 · Forecast86
Wed 11:00 · Forecast88
Wed 12:00 · Forecast90
Wed 13:00 · Forecast96
Wed 14:00 · Forecast113
Wed 15:00 · Forecast143
Wed 16:00 · Forecast169
Wed 17:00 · Forecast187
Wed 18:00 · Forecast200
Wed 19:00 · Forecast201
Wed 20:00 · Forecast200
Wed 21:00 · Forecast192
Wed 22:00 · Forecast177
Wed 23:00 · Forecast164
Thu 00:00 · Forecast150
Thu 01:00 · Forecast129
Thu 02:00 · Forecast124
Thu 03:00 · Forecast123
Thu 04:00 · Forecast121
Thu 05:00 · Forecast118
Thu 06:00 · Forecast116
Thu 07:00 · Forecast111
Thu 08:00 · Forecast105
Thu 09:00 · Forecast99
Thu 10:00 · Forecast97
Thu 11:00 · Forecast97
Thu 12:00 · Forecast104
Thu 13:00 · Forecast120
Thu 14:00 · Forecast136

Pollutants this hour

  • PM2.5 31.1 µg/m³ 24-hour mean 37.3 µg/m³ · 2.5× WHO’s 24-hour guideline (15) 95
  • PM10 33 µg/m³ 31
  • O₃ 123 µg/m³ 159
  • NO₂ 15 µg/m³ 7
  • SO₂ 37 µg/m³ 20
  • CO 1.00 mg/m³ 6

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
Jepara Central Java 77
Tasikmalaya West Java 86
Surabaya East Java 83
Malang East Java 105
Bandung West Java 165
Depok West Java 171
Bogor West Java 171

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 Semarang’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 Semarang right now?
159 on the US EPA scale (Unhealthy) at 19:00 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 Semarang today?
Consider shortening outdoor exercise; sensitive groups should move it indoors. The EPA’s statement for “Unhealthy”: Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. General guidance, not medical advice.

Will the air in Semarang get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 85 around 08:00 to 201 around 19:00 (4 Nov). Forecasts beyond a day are less certain.

How does Semarang compare with other cities?
Right now it is the 75th most polluted of 849 cities we track worldwide, and 6th of 25 in Indonesia, all on the same US EPA scale.

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