Worst air pollution Chatswood - Sydney, today and tomorrow
Today (17 September): Air quality in Chatswood is moderate. AQI and NO2 are moderate; PM2.5 and PM10 are fair; O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 PM (NO2: 44.9/100).
Tomorrow (18 September 2026): Air quality in Chatswood is moderate. PM2.5 increases to moderate; O3 increases to fair; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 53.7/100). Airmine updates local air quality forecasts four times daily.
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A commercial and residential hub on Sydney's leafy north shore, Chatswood mixes tree-lined streets with a dense shopping and transport interchange where trains, buses and heavy retail traffic converge. That combination means air quality here can vary block by block, cleaner in the surrounding residential streets and busier near the station precinct. Being elevated and inland, Chatswood doesn't get the same direct sea breeze as the coastal suburbs, so wood smoke can linger on cold winter nights, and summer bushfire haze from the wider region is a recurring seasonal visitor.
Today - 17 September | Pollution peaks at 18:00
AQI:
Moderate
44.9/100
PM2.5 (fine particles):
Fair
30.4/100
PM10 (coarse particles):
Fair
20.8/100
NO2 (nitrogen dioxide):
Moderate
44.9/100
O3 (ozone):
Good
11.9/100
SO2 (sulfur dioxide):
Good
3.6/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
12.9/100
Levels show the poorest local air quality during the day
Tomorrow - 18 September | Pollution peaks at 20:00
AQI:
Moderate
53.7/100
PM2.5 (fine particles):
Moderate
41.3/100
PM10 (coarse particles):
Fair
26.7/100
NO2 (nitrogen dioxide):
Moderate
53.7/100
O3 (ozone):
Fair
20.5/100
SO2 (sulfur dioxide):
Good
6.1/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
15.0/100
PM1 (ultrafine particles):
Fair
24.4/100
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Frequently Asked Questions
Is air quality bad in Chatswood right now?
On 17 September 2026, overall air quality in Chatswood is moderate. AQI is the main air quality indicator at 44.9/100. Pollution peaks around 6:00 PM (NO2: 44.9/100).
Will air quality be worse tomorrow in Chatswood?
On 18 September 2026, air quality conditions in Chatswood will be similar to today, with AQI forecast at moderate at 53.7/100. Pollution peaks around 8:00 PM (NO2: 53.7/100).
When is air pollution at its worst in Chatswood?
The period to plan around in Chatswood mirrors Sydney as a whole: the December-to-March bushfire season, when smoke from nearby fires drifts through on hot northerlies. A second dip comes in winter, when still nights trap wood-heater smoke near ground level. Sensitive groups should watch forecasts during that period rather than assume year-round conditions apply.
Are air quality levels in Chatswood 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: 16 September 2026 at 20:30 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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