Statistical data set
Figure 12: Hourly mean PM2.5 concentration at roadside and urban background sites, 2025
Updated 30 June 2026
| Site type | Hour | Number of sites | Mean concentration of PM2.5 (µg/m3) | 95% confidence interval for 'All sites' (+/-) |
|---|---|---|---|---|
| Urban Background | 1 | 72 | 8.400696902147734 | 0.27251286968979277 |
| Urban Background | 2 | 72 | 8.178148792350807 | 0.24192897594091298 |
| Urban Background | 3 | 72 | 8.038249555175023 | 0.23814113336588524 |
| Urban Background | 4 | 72 | 7.9382777041371595 | 0.2425201774519797 |
| Urban Background | 5 | 72 | 7.916153429021673 | 0.24238308011728146 |
| Urban Background | 6 | 72 | 7.987894867745766 | 0.24694218787620167 |
| Urban Background | 7 | 71 | 8.119065065427973 | 0.255393802897649 |
| Urban Background | 8 | 72 | 8.2186460339847809 | 0.2519073662433747 |
| Urban Background | 9 | 72 | 8.18389736392815 | 0.25201096552260305 |
| Urban Background | 10 | 72 | 7.987241706361775 | 0.23911710139783454 |
| Urban Background | 11 | 71 | 7.718662373524142 | 0.22628259231981174 |
| Urban Background | 12 | 71 | 7.441550805411609 | 0.21852733581253542 |
| Urban Background | 13 | 71 | 7.218559546055779 | 0.21363446485068377 |
| Urban Background | 14 | 72 | 7.041885567343711 | 0.20716765060722486 |
| Urban Background | 15 | 72 | 6.968287125112164 | 0.19635416029208322 |
| Urban Background | 16 | 72 | 7.012239780247729 | 0.19145579484014014 |
| Urban Background | 17 | 72 | 7.241973621002644 | 0.18636212739626912 |
| Urban Background | 18 | 72 | 7.680726496147185 | 0.2141598346758913 |
| Urban Background | 19 | 72 | 8.195928296568583 | 0.2375449704101155 |
| Urban Background | 20 | 72 | 8.702210088263088 | 0.26185846714529915 |
| Urban Background | 21 | 73 | 8.966662401676041 | 0.2755084410657483 |
| Urban Background | 22 | 73 | 8.955991718482327 | 0.2694349616516615 |
| Urban Background | 23 | 73 | 8.768985301176304 | 0.2630788255278333 |
| Urban Background | 24 | 73 | 8.548020065228854 | 0.2637669140595925 |
| Urban Traffic | 1 | 45 | 8.82309747375099 | 0.5143196545684631 |
| Urban Traffic | 2 | 45 | 8.421215855801979 | 0.42867442902487446 |
| Urban Traffic | 3 | 45 | 8.246049594028896 | 0.4198766909124964 |
| Urban Traffic | 4 | 45 | 8.156064581526373 | 0.4257779900372362 |
| Urban Traffic | 5 | 45 | 8.179922446299642 | 0.436074557709581 |
| Urban Traffic | 6 | 45 | 8.383109508419636 | 0.4572506889192397 |
| Urban Traffic | 7 | 45 | 8.663358031386007 | 0.473409696745705 |
| Urban Traffic | 8 | 45 | 8.88022265101647 | 0.4835145544199448 |
| Urban Traffic | 9 | 45 | 8.858696513584473 | 0.46545110008699725 |
| Urban Traffic | 10 | 45 | 8.721007312947608 | 0.4533024885661454 |
| Urban Traffic | 11 | 45 | 8.436006669824076 | 0.43394331834278527 |
| Urban Traffic | 12 | 45 | 8.15059333709094 | 0.4038663807879869 |
| Urban Traffic | 13 | 45 | 7.91063234517307 | 0.3926681726809912 |
| Urban Traffic | 14 | 45 | 7.735890224033693 | 0.37309443754176264 |
| Urban Traffic | 15 | 45 | 7.64737230845416 | 0.3488543735517751 |
| Urban Traffic | 16 | 45 | 7.687462777444186 | 0.3256421939961788 |
| Urban Traffic | 17 | 45 | 7.957880325397605 | 0.3291742325318441 |
| Urban Traffic | 18 | 45 | 8.439969234613406 | 0.36701024054306874 |
| Urban Traffic | 19 | 45 | 8.994505158745083 | 0.3909601341125564 |
| Urban Traffic | 20 | 45 | 9.44402335507245 | 0.4265285288566481 |
| Urban Traffic | 21 | 45 | 9.624344585756512 | 0.4589234947191425 |
| Urban Traffic | 22 | 45 | 9.576935406325063 | 0.46096225069939656 |
| Urban Traffic | 23 | 45 | 9.31628339890036 | 0.4377961444630701 |
| Urban Traffic | 24 | 45 | 8.970559602380504 | 0.4329382364158896 |