Statistical data set
Figure 11: Monthly mean PM2.5 concentration at roadside and urban background sites, 2025
Updated 30 June 2026
| Site type | Month | Number of sites | Mean concentration of PM2.5 (µg/m3) | 95% confidence interval for 'All sites' (+/-) |
|---|---|---|---|---|
| Urban Background | Jan | 67 | 10.60291204092788 | 0.5155876169358694 |
| Urban Background | Feb | 67 | 13.21440397019212 | 0.4283991252957172 |
| Urban Background | Mar | 70 | 14.199609064323642 | 0.5100844287917999 |
| Urban Background | Apr | 72 | 9.726823796075346 | 0.2827696450919632 |
| Urban Background | May | 74 | 7.060637037773463 | 0.17680599422450644 |
| Urban Background | Jun | 75 | 6.21304957201165 | 0.14831601771046046 |
| Urban Background | Jul | 77 | 5.45232826028742 | 0.14305741151704807 |
| Urban Background | Aug | 76 | 6.312822476514056 | 0.15032945003368556 |
| Urban Background | Sep | 76 | 4.58667221741484 | 0.1487991357743022 |
| Urban Background | Oct | 78 | 6.316545962501818 | 0.22392358053932976 |
| Urban Background | Nov | 78 | 6.143105548908865 | 0.2432718254013739 |
| Urban Background | Dec | 81 | 7.244145267119084 | 0.2123060115873405 |
| Urban Traffic | Jan | 43 | 11.23590090935728 | 0.7482136446860173 |
| Urban Traffic | Feb | 44 | 13.797694144128338 | 0.7415371597438308 |
| Urban Traffic | Mar | 46 | 14.780129104038597 | 0.8626025641857362 |
| Urban Traffic | Apr | 47 | 10.161122069324575 | 0.495976941526622 |
| Urban Traffic | May | 48 | 7.638910059825357 | 0.34461608963304025 |
| Urban Traffic | Jun | 49 | 6.7140367824569465 | 0.34103191964931384 |
| Urban Traffic | Jul | 48 | 5.880900699530052 | 0.25962750259835743 |
| Urban Traffic | Aug | 50 | 6.739227897570406 | 0.30425777459795694 |
| Urban Traffic | Sep | 49 | 5.126796269471703 | 0.31200521423820016 |
| Urban Traffic | Oct | 50 | 6.776964805514122 | 0.3572717267845394 |
| Urban Traffic | Nov | 47 | 6.915603458777002 | 0.4679791036165241 |
| Urban Traffic | Dec | 48 | 7.795151134173121 | 0.385802300563029 |