In 2023, all but 3 of 46 stations recorded annual average PM2.5 levels, which met the national standard (see PM2.5 daily and annual summary graph). In 2022, all stations met the standard.
Annual average PM2.5 during 2023 ranged from 4.3 µg/m3 at Coffs Harbour to 8.6 µg/m3 at Armidale. This compares with a range during 2022 of 2.7 µg/m3 at Morisset to 7.1 µg/m3 at Armidale.
The highest recorded annual average in 2023 was at Armidale (8.6 µg/m3), reflecting the influence of woodsmoke in winter. High annual average PM2.5 at Bradfield Highway is due mainly to traffic emissions but also reflects the added impact of 4 extreme air pollution days, due to the September hazard reduction burns.
Across the network, annual average PM2.5 levels increased by approximately 30% compared to 2022.
Stockton station in Newcastle Local region also exceeded the annual standard. See the Hunter Valley focus area.