Worst air pollution Mosman - Sydney, today and tomorrow
Today (17 September): Air quality in Mosman is moderate. AQI and PM2.5 are moderate; PM10 and NO2 are fair; O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (PM2.5: 40.5/100).
Tomorrow (18 September 2026): Air quality in Mosman is moderate. NO2 increases to moderate; O3 increases to fair; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 59.5/100). 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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Mosman sits on a harbourside peninsula on Sydney's Lower North Shore, its leafy, low-density streets benefiting from strong, near-constant Harbour and ocean-adjacent breezes that keep background air quality among the best of any inner suburb. Traffic concentrates around the Spit Bridge approach, a periodic bottleneck, but elsewhere local roads carry light volumes. There is no industry here. Bushfire smoke is a periodic summer risk from surrounding hinterland bushland, but overall conditions are consistently clean and well-ventilated.
Today - 17 September | Pollution peaks at 23:00
AQI:
Moderate
40.5/100
PM2.5 (fine particles):
Moderate
40.5/100
PM10 (coarse particles):
Fair
26.5/100
NO2 (nitrogen dioxide):
Fair
39.6/100
O3 (ozone):
Good
12.8/100
SO2 (sulfur dioxide):
Good
5.9/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
5.4/100
PM1 (ultrafine particles):
Good
17.5/100
Levels show the poorest local air quality during the day
Tomorrow - 18 September | Pollution peaks at 20:00
AQI:
Moderate
59.5/100
PM2.5 (fine particles):
Moderate
44.6/100
PM10 (coarse particles):
Fair
31.9/100
NO2 (nitrogen dioxide):
Moderate
59.5/100
O3 (ozone):
Fair
22.6/100
SO2 (sulfur dioxide):
Good
12.1/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
10.9/100
PM1 (ultrafine particles):
Fair
29.6/100
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Frequently Asked Questions
Is air quality bad in Mosman right now?
On 17 September 2026, overall air quality in Mosman is moderate. AQI is the main air quality indicator at 40.5/100. Pollution peaks around 11:00 PM (PM2.5: 40.5/100).
Will air quality be worse tomorrow in Mosman?
On 18 September 2026, air quality conditions in Mosman will be similar to today, with AQI forecast at moderate at 59.5/100. Pollution peaks around 8:00 PM (NO2: 59.5/100).
When is air pollution at its worst in Mosman?
Mosman's harbourside, tree-lined setting typically enjoys some of Sydney's cleanest air, with the main exception being summer bushfire smoke (December–March) carried in on strong winds from inland fires. Otherwise, expect consistently good conditions here, with little seasonal wood-smoke build-up thanks to the suburb's exposure to harbour breezes.
Are air quality levels in Mosman 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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