Worst air pollution Guildford - Perth, today and tomorrow
Today (17 September): Air quality in Guildford is fair. AQI, PM2.5, and NO2 are fair; PM10, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 PM (PM2.5: 25.5/100).
Tomorrow (18 September 2026): Air quality in Guildford is fair. NO2 decreases to good; all other pollutants stay as today. Pollution peaks around 3:00 PM (PM2.5: 23.9/100). 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 - 17 September | Pollution peaks at 22:00
AQI:
Fair
25.5/100
PM2.5 (fine particles):
Fair
25.5/100
PM10 (coarse particles):
Good
13.0/100
NO2 (nitrogen dioxide):
Fair
23.5/100
O3 (ozone):
Good
19.9/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
6.5/100
PM1 (ultrafine particles):
Good
12.1/100
Levels show the poorest local air quality during the day
Tomorrow - 18 September | Pollution peaks at 15:00
AQI:
Fair
23.9/100
PM2.5 (fine particles):
Fair
23.9/100
PM10 (coarse particles):
Good
14.3/100
NO2 (nitrogen dioxide):
Good
16.6/100
O3 (ozone):
Good
18.4/100
SO2 (sulfur dioxide):
Good
1.9/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
10.2/100
Other Landmarks in Perth
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Frequently Asked Questions
Is air quality bad in Guildford right now?
On 17 September 2026, overall air quality in Guildford is fair. AQI is the main air quality indicator at 25.5/100. Pollution peaks around 10:00 PM (PM2.5: 25.5/100).
Will air quality be worse tomorrow in Guildford?
On 18 September 2026, air quality conditions in Guildford will be similar to today, with AQI forecast at fair at 23.9/100. Pollution peaks around 3:00 PM (PM2.5: 23.9/100).
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: 17 September 2026 at 03:00 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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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