Melbourne, Australia Air Quality & Smog

Dominant pollutants, when pollution and smog are worst, a notable historical episode, and the official monitoring agencies for Melbourne, Australia — plus how to check the current reading. Melbourne reports air quality on the Australian Air Quality Index — our full guide explains how that scale works and how it compares to the US AQI.

Dominant pollutants

PM2.5 (bushfire and planned-burn smoke), ozone, occasional dust.

Seasonal pattern: when smog is worst

Melbourne's air is usually good, with episodic challenges: autumn planned-burn smoke drifting in from surrounding forests, summer bushfire smoke, and rare dust events. The city is also famous for an unusual air-health hazard — epidemic thunderstorm asthma, when storm outflows rupture pollen into breathable fragments.

A notable air-quality episode

On 21 November 2016, Melbourne suffered the world's most severe recorded epidemic thunderstorm-asthma event — thousands fell ill within hours and ten people died, overwhelming emergency services. The 2019–20 bushfire season later brought prolonged smoke to the city.

The local index and who runs it

Melbourne reports air quality using the Australian Air Quality Index, not the US AQI — so the same air can read as a different number than you may be used to. EPA Victoria publishes hourly air quality and the AQI through its AirWatch service, including smoke and burn-off advisories.

• EPA Victoria

How to check air quality in Melbourne

For the official live reading, the agency portals above are the canonical source. To understand what the numbers mean, start with our guide to the Australian Air Quality Index and the broader comparison of world air-quality indices. Smog Report puts glanceable air quality on your iPhone — widgets, Live Activities, Siri, and Apple Watch — free and with no account.

Common questions about Melbourne air quality

Why does Melbourne have air-quality and smog problems?

Melbourne's air is usually good, with episodic challenges: autumn planned-burn smoke drifting in from surrounding forests, summer bushfire smoke, and rare dust events. The city is also famous for an unusual air-health hazard — epidemic thunderstorm asthma, when storm outflows rupture pollen into breathable fragments.

What are the main air pollutants in Melbourne?

Melbourne's dominant pollutants are PM2.5 (bushfire and planned-burn smoke), ozone, occasional dust. The reading on any given day is usually driven by whichever of these is highest.

Has Melbourne had a major air-quality or smog event?

On 21 November 2016, Melbourne suffered the world's most severe recorded epidemic thunderstorm-asthma event — thousands fell ill within hours and ten people died, overwhelming emergency services. The 2019–20 bushfire season later brought prolonged smoke to the city.

What air-quality index does Melbourne use?

Melbourne reports air quality on the Australian Air Quality Index (AQI), not the US AQI — so the same air can read as a different number than you may be used to. For live, glanceable readings on your iPhone, the free Smog Report app auto-selects the right local index for wherever you are.

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