Worst air pollution Guildford - Perth, today and tomorrow
Today (4 August): Air quality in Guildford is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 17.8/100).
Tomorrow (5 August 2026): Air quality in Guildford is fair. AQI worsens to fair; PM2.5 increases to fair; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 PM (PM1: 24.2/100). 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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Guildford sits in the historic Swan Valley wine region east of Perth, an inland position that receives markedly weaker afternoon sea-breeze ventilation than the western river suburbs, allowing heat and haze to build more readily on calm days. Dust from surrounding vineyards and agricultural land is a notable dry-season factor. Bushfire smoke is a periodic summer risk from the nearby Darling Range. There is no heavy industry. Overall, background air quality here reflects the more inland Swan Valley climate pattern.
Today - 4 August | Pollution peaks at 14:00
AQI:
Good
17.8/100
PM2.5 (fine particles):
Good
11.3/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Good
12.9/100
O3 (ozone):
Good
17.8/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.1/100
PM1 (ultrafine particles):
Good
12.0/100
Levels show the poorest local air quality during the day
Tomorrow - 5 August | Pollution peaks at 23:00
AQI:
Fair
24.2/100
PM2.5 (fine particles):
Fair
20.0/100
PM10 (coarse particles):
Good
5.8/100
NO2 (nitrogen dioxide):
Good
14.8/100
O3 (ozone):
Good
16.5/100
SO2 (sulfur dioxide):
Good
2.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.3/100
PM1 (ultrafine particles):
Fair
24.2/100
Other Landmarks in Perth
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Frequently Asked Questions
Is air quality bad in Guildford right now?
On 4 August 2026, overall air quality in Guildford is good. AQI is the main air quality indicator at 17.8/100. Pollution peaks around 2:00 PM (O3: 17.8/100).
Will air quality be worse tomorrow in Guildford?
On 5 August 2026, air quality conditions in Guildford will be worse than today, with AQI forecast at fair at 24.2/100. Pollution peaks around 11:00 PM (PM1: 24.2/100).
When is air pollution at its worst in Guildford?
Guildford, being further inland along the Swan Valley, can be more exposed to lingering bushfire smoke during summer, December to March, than suburbs closer to the coast, since it sits further from the moderating sea breeze. Outside this period, expect generally clean air.
Are air quality levels in Guildford 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: 4 August 2026 at 16:38 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.
For long term forecasts and maps, see the Airmine app