in 2025, with 162 out of 265 total cities (61%) meeting the WHO annual PM2.5 guideline. While Australia. improved slightly, dropping from 4.5 μg/m3 to 4.4 μg/ μg/m3. New Caledonia and French Polynesia reported averages of 3.6 μg/m3 and 1.8 μg/m3, respectively. in 2025. Wellington held steady at 4.3 μg/m3, while Canberra improved to 3.6 μg/m3 from 3.9 in 2024. Range of 2025 average PM2.5 (μg/m3) across regional cities Papeete saw a significant drop from 2.8 to 1.5 μg/m3, Air quality averages were heavily impacted by June 2025, which saw record-breaking cold across New South Wales, Australia.11 This surge in cold weather correlated with elevated PM2.5 levels, likely due to increased woodsmoke from home heating. Similarly, 米 Nelson, New Zealand New Zealand struggled during the May-August period, quality. This trend is driven by New Zealand's reliance on solid fuel; residential wood smoke remains the in the country, with one-third of residents utilizing wood or pellet burners as their primary heat source. 米Levin, New Zealand in 2025, from its 248 cities 2024 total. Australia added four new cities to reach 231, with its monitoring low-cost sensors. Monitoring remains specialized Noumea, while French Polynesia depends entirely on
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