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Pollutant Concentrations

Readings on 21 Feb 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 5(3) 18(18) 27(-) 40(17) 0.3(3) 9(39)
South 5(3) 20(20) 13(-) 37(16) 0.3(3) 8(34)
East 9(5) 18(18) 4(-) 46(19) 0.6(6) 11(47)
West 5(3) 20(20) 10(-) 49(21) 0.4(4) 10(43)
Central 5(3) 22(22) 28(-) 53(23) 0.2(2) 10(42)

1-hr PM2.5 (µg/m3)b Readings on 20 Feb 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 4 5 12 5 7 8 7 8 13 8 21 5
South 10 6 8 5 7 5 9 6 9 14 4 8
East 21 12 7 8 10 12 10 5 13 23 7 13
West 7 3 6 6 9 7 6 9 11 13 14 10
Central 15 10 8 14 12 7 7 7 6 9 6 7
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 7 16 15 12 12 10 6 10 8 7 11 11
South 9 10 13 18 17 7 4 9 6 3 4 7
East 9 12 11 13 13 10 13 15 6 9 8 11
West 12 10 12 10 18 16 5 8 5 11 6 8
Central 9 15 8 11 13 10 10 8 15 9 8 12

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 20 Feb 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 33 36 37 32 35 34 34 31 34 43 43 45
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 39 43 47 51 52 52 46 40 36 36 33 35



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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