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Pollutant Concentrations

Air quality readings will be available hourly from 1am to 12am.

Readings on 14 Oct 2014

View reading for:

Region 24-hr Sulphur dioxide
(µg/m3) 		24-hr PM10
(µg/m3) 		1-hr Nitrogen dioxide
(µg/m3)a 		8-hr Ozone
(µg/m3) 		8-hr Carbon monoxide
(mg/m3) 		24-hr PM2.5
(µg/m3)
North 19(12) 45(45) 57(-) 13(6) 0.7(7) 25(65)
South 18(11) 40(40) 37(-) 36(15) 0.6(6) 28(69)
East 10(6) 35(35) 22(-) 45(19) 0.6(6) 26(67)
West 14(9) 54(53) 83(-) 63(27) 0.7(7) 38(80)
Central 23(14) 37(37) 79(-) 38(16) 0.7(7) 25(65)

1-hr PM2.5 (µg/m3)b Readings on 13 Oct 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 18 17 31 31 21 21 16 19 15 16 19 20
South 30 31 20 26 24 23 11 17 19 24 41 46
East 21 31 31 39 40 28 22 23 23 29 25 25
West 46 43 40 36 27 22 30 25 27 27 32 37
Central 30 28 22 23 26 22 15 14 16 16 24 17
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 20 27 28 29 39 17 16 16 31 50 43 29
South 46 55 43 49 57 32 10 8 16 14 13 7
East 25 20 25 21 20 24 18 18 37 27 31 26
West 37 33 31 56 62 69 37 39 38 35 46 31
Central 17 24 35 36 33 29 24 32 23 28 27 29

Note:
a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on 13 Oct 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 73 70 70 71 70 68 64 61 59 61 64 67
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 70 71 73 76 80 81 74 67 65 68 72 70

Hourly updates of 3-hr PSI readings are provided from 1am to 12am. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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