Worst air pollution Semarang, today and tomorrow
Today (10 August): Air quality in Semarang is very poor. AQI and O3 are very poor; PM2.5, NO2, and PM1 are fair; SO2 is medium; PM10, CO, and HCHO are good. Pollution peaks around 3:00 PM (O3: 86.9/100).
Tomorrow (11 August 2026): Air quality in Semarang is very poor. NO2 decreases to medium; PM1 decreases to medium; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 92.2/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Semarang's air quality reflects Central Java's capital on the flat Java Sea coastal plain, with vehicle traffic on the Jalan Tol Semarang-Solo and the surrounding manufacturing, textile, and port operations contributing local sources. Java Sea breezes provide coastal ventilation, while the Diponegoro industrial corridor and the extraordinary two-stroke vehicle density maintain moderate to elevated readings and the city's low-lying coastal position with limited natural topographic dispersal creates concentration under calm conditions throughout the year.
Today - 10 August | Pollution peaks at 15:00
AQI:
Very poor
86.9/100
PM2.5 (fine particles):
Fair
33.3/100
PM10 (coarse particles):
Good
10.0/100
NO2 (nitrogen dioxide):
Fair
31.9/100
O3 (ozone):
Very poor
86.9/100
SO2 (sulfur dioxide):
Medium
44.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
13.1/100
PM1 (ultrafine particles):
Fair
37.7/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 16:00
AQI:
Very poor
92.2/100
PM2.5 (fine particles):
Fair
38.7/100
PM10 (coarse particles):
Good
12.2/100
NO2 (nitrogen dioxide):
Medium
41.8/100
O3 (ozone):
Very poor
92.2/100
SO2 (sulfur dioxide):
Medium
47.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
11.0/100
PM1 (ultrafine particles):
Medium
40.6/100
Pollen forecast in Semarang
View pollen forecastFrequently Asked Questions
Is air quality bad in Semarang right now?
On 10 August 2026, overall air quality in Semarang is very poor. AQI is the main air quality indicator at 86.9/100. Pollution peaks around 3:00 PM (O3: 86.9/100).
Will air quality be worse tomorrow in Semarang?
On 11 August 2026, air quality conditions in Semarang will be similar to today, with AQI forecast at very poor at 92.2/100. Pollution peaks around 4:00 PM (O3: 92.2/100).
When is air pollution at its worst in Semarang?
Reduced air quality in Semarang is most likely when vegetation introduced urban trees and coastal vegetation pollen peaks, alongside periods of vehicle traffic on the Jalan Tol Semarang-Solo and the surrounding manufacturing, textile, and port operations; a shift to wetter or windier weather typically brings noticeable relief.
Are air quality levels in Semarang based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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