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Pollutant Concentrations

Readings on 22 Jan 2015

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 10(6) 32(32) 30(-) 25(10) 0.4(4) 17(56)
South 28(17) 38(38) 6(-) 22(9) 0.5(5) 19(59)
East 5(3) 33(33) 7(-) 41(17) 0.5(5) 22(62)
West 5(3) 37(37) 7(-) 26(11) 0.5(5) 20(60)
Central 7(4) 36(36) 33(-) 26(11) 0.5(5) 17(56)

1-hr PM2.5 (µg/m3)b Readings on 21 Jan 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 16 12 14 19 18 19 21 20 18 26 21 15
South 18 25 18 9 16 22 20 29 33 21 24 27
East 21 19 21 26 20 21 21 28 25 22 26 27
West 12 20 17 21 19 24 19 22 26 24 22 31
Central 21 23 11 18 17 22 14 20 18 14 15 17
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 19 14 15 13 18 13 16 12 14 17 13 14
South 24 22 30 29 16 7 9 5 9 21 17 11
East 22 23 22 26 24 17 20 17 16 20 22 17
West 26 24 21 22 33 8 5 15 10 18 26 20
Central 19 14 16 23 23 11 10 11 16 21 21 10

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 21 Jan 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 56 57 57 58 57 59 59 62 63 63 63 62
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 63 62 61 61 62 59 55 49 51 54 57 58



The real-time data is automatically published as soon as it is generated by our air monitoring stations. The data is subject to verification and correction subsequently if necessary.

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