Statistical data set
Figure 12: Hourly mean PM2.5 concentration at roadside and urban background sites, 2024
Updated 26 June 2025
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| Site type | Hour | Mean concentration of PM2.5 (µg/m3) | 95% confidence interval for 'All sites' (+/-) | Number of sites |
|---|---|---|---|---|
| Urban Background | 1:00 AM | 7.668056611 | 0.234170847 | 60 |
| Urban Background | 2:00 AM | 7.457453315 | 0.216479227 | 60 |
| Urban Background | 3:00 AM | 7.300372445 | 0.204995802 | 60 |
| Urban Background | 4:00 AM | 7.201455445 | 0.202387066 | 60 |
| Urban Background | 5:00 AM | 7.12186906 | 0.201654059 | 60 |
| Urban Background | 6:00 AM | 7.100414577 | 0.204503551 | 60 |
| Urban Background | 7:00 AM | 7.123232447 | 0.209257243 | 60 |
| Urban Background | 8:00 AM | 7.125179456 | 0.209860756 | 60 |
| Urban Background | 9:00 AM | 7.043052637 | 0.205656738 | 60 |
| Urban Background | 10:00 AM | 6.880351556 | 0.195938962 | 60 |
| Urban Background | 11:00 AM | 6.673913565 | 0.197422875 | 60 |
| Urban Background | 12:00 PM | 6.509559055 | 0.214690256 | 60 |
| Urban Background | 1:00 PM | 6.355846625 | 0.215948961 | 60 |
| Urban Background | 2:00 PM | 6.260316466 | 0.2083048 | 60 |
| Urban Background | 3:00 PM | 6.234507114 | 0.202726044 | 60 |
| Urban Background | 4:00 PM | 6.328303799 | 0.203853319 | 60 |
| Urban Background | 5:00 PM | 6.596406612 | 0.212532359 | 60 |
| Urban Background | 6:00 PM | 7.01980921 | 0.232702911 | 60 |
| Urban Background | 7:00 PM | 7.539996201 | 0.25851665 | 60 |
| Urban Background | 8:00 PM | 7.943184292 | 0.275181429 | 60 |
| Urban Background | 9:00 PM | 8.1571788 | 0.279561004 | 60 |
| Urban Background | 10:00 PM | 8.128782108 | 0.263402406 | 60 |
| Urban Background | 11:00 PM | 8.011045992 | 0.2530737 | 60 |
| Urban Background | 12:00 AM | 7.817151705 | 0.238884267 | 60 |
| Urban Traffic | 1:00 AM | 7.809458229 | 0.719980189 | 23 |
| Urban Traffic | 2:00 AM | 7.400647529 | 0.644852719 | 23 |
| Urban Traffic | 3:00 AM | 7.211618225 | 0.640540769 | 23 |
| Urban Traffic | 4:00 AM | 7.094425015 | 0.635753806 | 23 |
| Urban Traffic | 5:00 AM | 7.091241402 | 0.64996125 | 23 |
| Urban Traffic | 6:00 AM | 7.228682386 | 0.666339284 | 23 |
| Urban Traffic | 7:00 AM | 7.472443643 | 0.679646441 | 23 |
| Urban Traffic | 8:00 AM | 7.64711567 | 0.687308913 | 23 |
| Urban Traffic | 9:00 AM | 7.624298951 | 0.678764938 | 23 |
| Urban Traffic | 10:00 AM | 7.402798925 | 0.658625362 | 23 |
| Urban Traffic | 11:00 AM | 7.248525141 | 0.62947097 | 23 |
| Urban Traffic | 12:00 PM | 7.076634584 | 0.602445233 | 23 |
| Urban Traffic | 1:00 PM | 6.939017279 | 0.622735246 | 23 |
| Urban Traffic | 2:00 PM | 6.851348648 | 0.590823622 | 23 |
| Urban Traffic | 3:00 PM | 6.858614521 | 0.595417347 | 23 |
| Urban Traffic | 4:00 PM | 6.987258687 | 0.587663078 | 23 |
| Urban Traffic | 5:00 PM | 7.30833156 | 0.600708032 | 23 |
| Urban Traffic | 6:00 PM | 7.710679359 | 0.639397746 | 23 |
| Urban Traffic | 7:00 PM | 8.174518354 | 0.708539265 | 23 |
| Urban Traffic | 8:00 PM | 8.480040557 | 0.740991282 | 23 |
| Urban Traffic | 9:00 PM | 8.612228085 | 0.753835903 | 23 |
| Urban Traffic | 10:00 PM | 8.481722299 | 0.737440474 | 23 |
| Urban Traffic | 11:00 PM | 8.193508795 | 0.704232814 | 23 |
| Urban Traffic | 12:00 AM | 7.889883176 | 0.692543231 | 23 |