Air quality comparison · Australia, 2721 km apart
Melbourne vs Perth Air quality index (AQI) today
Melbourne has cleaner air than Perth right now: AQI 17 (Good) against 25 (Good).
Both sit in the same EPA band, so the health advice is the same for each today. But over the past 7 days, on modeled daily averages, Perth averaged AQI 40 against 42, and it was the cleaner of the two on 3 of those days. Perth has lost more forest since 2001. Melbourne has more tree cover.
Updated . Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf.
Melbourne17Perth25
Head to head
Melbourne vs Perth at a glance
Melbourne is ahead on 5 of 6 measures, and Perth on 1. The better figure in each row is marked.
| Melbourne | Perth | |
|---|---|---|
| Air quality nowUS AQI. Lower is better. | 17 (better) | 25 |
| PM2.5Fine particles, µg/m³. | 3.1 (better) | 4.5 |
| Past week's averageUS AQI, 7 days. | 42 | 40 (better) |
| Forest lost since 2001Within 10 km of the center. | 32 ha (better) | 78 ha |
| Tree coverWithin 2 km of the center. | 20.2% (better) | 18.1% |
| Trees still neededTo reach a healthy canopy. | 29.5K (better) | 30.3K |
Air quality today
What is the air like in Melbourne and Perth right now?
Melbourne has cleaner air than Perth right now: AQI 17 (Good) against 25 (Good). PM2.5 is setting the index in both.
Both readings come from nearby ground stations.
MelbournePerth
Concentrations at the same moment as the index above, for the pollutants both places report. Lower is better. The dark marks on the PM2.5 and PM10 rows show the WHO's 24-hour guidelines (15 and 45 µg/m³).
Melbourne: Ground station · Melbourne CBD, 900 m away · median of 3 stations. Data: World Air Quality Index Project, Environment Protection Authority | EPA Victoria.
Perth: Ground station · NASA GSFC Rutgers Calib. N5, 5.1 km away. Data: OpenAQ · Clarity.
The past week
Which had cleaner air over the past 7 days?
But over the past 7 days, on modeled daily averages, Perth averaged AQI 40 against 42, and it was the cleaner of the two on 3 of those days. A single reading can catch a city on a bad afternoon; the week says whether it was the weather or the place.
- Cleaner days
- Melbourne4Perth3
- Average AQI
- Melbourne42Perth40
- Worst day, AQI
- Melbourne52Perth46
The daily numbers (7 days)
| Day | Melbourne | Perth |
|---|---|---|
| Nov 5 | 43 | 46 |
| Nov 6 | 51 | 41 |
| Nov 7 | 26 | 41 |
| Nov 8 | 35 | 43 |
| Nov 9 | 47 | 27 |
| Nov 10 | 40 | 43 |
| Nov 11 | 52 | 37 |
Daily averages from the CAMS atmospheric model for both places, so the week compares like with like. They can differ from today's reading at the top of the page wherever that comes from a ground station.
What it means today
Is it safe to go outside in Melbourne and Perth today?
Air quality is satisfactory for everyone. Both are in the same EPA band today (Good), so the advice is the same.
Exercise outdoors
A good day to be active outside.
Windows
Open them to air the house.
Masks
Not needed.
Air purifier
Not needed.
Against everywhere else
How do Melbourne and Perth compare with the rest of the world?
Right now Melbourne's air is cleaner than 91% of the 5,420 places Airleaf tracks, and Perth's is cleaner than 84%. Within Australia, that is 45% and 40% of its 21 measured places.
Cleaner air than…
- Melbourne
- Beats 91%
- Perth
- Beats 84%
More tree cover than…
- Melbourne
- Beats 47%
- Perth
- Beats 42%
Includes model estimates as well as station readings, so it can differ from our most polluted and cleanest air rankings, which use station readings only.
Deforestation · 2001–2025
Which has lost more forest, Melbourne or Perth?
Perth has lost more: about 78 ha of forest within 10 km of its center from 2001 to 2025, against 32 ha around Melbourne. 70 ha of that was cleared for good, for farms, mines or towns.
Measured within 10 km of each center, from the yearly satellite maps of forest loss: a wider circle than the one for tree cover, because forest is usually lost at a city's edges.
Worst year: 2003, with 6 ha lost.
Worst year: 2007, with 10 ha lost.
| Melbourne | Perth | |
|---|---|---|
| Forest lost since 2001Cleared, burned or logged. | 32 ha (better) | 78 ha |
| Share of its forestOf what it had in 2000. | 4.4% (better) | 9.3% |
| Cleared for goodTurned into farms, mines or towns. | 21 ha (better) | 70 ha |
| Recent trend2021–2025 against the five years before. | Too little to call | Too little to call |
| Main known cause | Towns and roads (65%) | Towns and roads (90%) |
Satellite timelapses
Watch both change, year by year
A clear satellite photo a year of the land around each city. Press play, turn on the forest cleared since the first year, or drag the before and after.
Melbourne
2017: satellite photo from February 2017 of a 5 × 5 km area in the city center.
Perth
2017: satellite photo from March 2017 of a 5 × 5 km area in the city center.
Trees
Which has more trees, Melbourne or Perth?
Melbourne has more tree cover: 20.2% of the land within 2 km of its center against 18.1% around Perth, or about 60,731 trees against 46,116.
The dark mark is each place's canopy target: 30% of the land, raised where air quality is poor.
| Melbourne | Perth | |
|---|---|---|
| Trees standingEstimated from the canopy area. | 60.7K (better) | 46.1K |
| Trees still neededTo reach the target. Fewer is better. | 29.5K (better) | 30.3K |
| CO₂ absorbed each yearBy the trees already standing. | 1.3M kg (better) | 1.0M kg |
Tree cover on the satellite image
The same 2 km radius around each center, with the tree cover the satellite found marked on it.
Reading these numbers
How this comparison is made
Air quality index
The US EPA index, computed from current pollutant concentrations: ground stations where a place has them nearby, and the CAMS atmospheric model everywhere else. It moves hour to hour, so it is a snapshot rather than a verdict on either place. The guideline marks are from the WHO's 2021 air quality guidelines.
Trees and forest
Tree cover is the share of ground under canopy within 2 km of each center, read from Sentinel-2 satellite imagery at 10 m detail. It measures that circle, not the whole municipality, which is what makes the two comparable. Forest loss comes from the University of Maryland's Global Forest Change maps.
More on the method on the About Airleaf page.
Frequently asked
Melbourne vs Perth: your questions answered
Is Melbourne cleaner than Perth?
On air quality, yes, right now: Melbourne reads AQI 17 against 25, a gap of 8 points on the US EPA index. This is a live reading rather than an annual average, so it can reverse within a day. But over the past 7 days, on modeled daily averages, Perth averaged AQI 40 against 42, and it was the cleaner of the two on 3 of those days.
Is it safe to exercise outdoors in Melbourne and Perth today?
The advice is the same for both today. Air quality is satisfactory for everyone. Melbourne reads AQI 17 and Perth reads AQI 25.
Which has lost more forest, Melbourne or Perth?
Perth has lost more: about 78 ha of forest within 10 km of its center from 2001 to 2025, against 32 ha around Melbourne. 70 ha of that was cleared for good, for farms, mines or towns.
Which has more trees, Melbourne or Perth?
Melbourne has more tree cover: 20.2% of the land within 2 km of its center against 18.1% around Perth, or about 60,731 trees against 46,116. Both figures describe the same-sized circle of ground around each center, not the whole municipality.
How many more trees do Melbourne and Perth need?
Melbourne needs about 29,464 more to reach its canopy target of 30%, and Perth about 30,319 to reach 30%. The target starts at 30% of the land and rises where air quality is poor.
Are Melbourne and Perth measured the same way?
The method is the same: the US EPA index for air, and Sentinel-2 satellite imagery at 10 m detail over an identical radius for trees. Both readings come from nearby ground stations. Nothing is adjusted for population, city limits or climate.
How often does the Melbourne vs Perth comparison update?
The air readings refresh about once an hour, and each reading's local time is shown at the top of the page. Tree cover comes from the latest clear satellite image of each area (Mar 10, 2026 and Mar 6, 2026), and the forest figures are published yearly.
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