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Pollutant Concentrations

Readings on 05 Apr 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 9(6) 43(43) 28(-) 38(16) 0.5(5) 25(66)
South 40(25) 37(37) 23(-) 52(22) 0.3(3) 25(65)
East 16(10) 29(29) 10(-) 57(24) 0.4(4) 23(63)
West 34(21) 43(43) 41(-) 63(27) 0.5(5) 26(67)
Central 14(9) 36(36) 40(-) 43(18) 0.3(3) 23(63)

1-hr PM2.5 (µg/m3)b Readings on 04 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 9 30 27 31 36 24 22 20 22 23 30 27
South 11 22 29 26 24 30 26 28 23 21 26 31
East 12 15 18 24 40 37 34 22 20 22 26 27
West 14 12 24 31 32 35 18 27 24 27 24 29
Central 12 16 13 19 20 27 29 29 26 13 25 30
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 24 28 30 32 31 30 24 33 24 13 21 22
South 29 36 33 30 31 25 29 9 16 24 19 16
East 27 28 23 29 27 16 24 15 17 14 15 9
West 33 32 32 28 31 34 36 28 16 18 18 19
Central 30 33 28 31 34 27 31 24 16 18 13 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 04 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 39 53 57 63 67 70 70 68 65 64 64 66
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 69 71 71 71 71 70 70 66 63 59 57 56



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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