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Pollutant Concentrations

Readings on 13 Jun 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 6(4) 30(30) 26(-) 8(4) 0.6(6) 17(57)
South 25(16) 16(16) 11(-) 3(1) 0.4(4) 9(38)
East 13(8) 12(12) 20(-) 3(1) 0.5(5) 7(28)
West 18(11) 23(23) 28(-) 8(4) 0.5(5) 14(53)
Central 14(8) 14(14) 38(-) 3(1) 0.5(5) 7(30)

1-hr PM2.5 (µg/m3)b Readings on 12 Jun 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 22 27 14 22 20 32 23 19 24 25 27 20
South 9 10 7 2 4 6 4 10 3 15 27 16
East 5 5 5 3 4 5 3 6 6 8 8 10
West 19 28 28 22 17 13 13 19 19 22 11 4
Central 7 6 8 3 4 5 4 7 7 4 6 10
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 4 7 7 15 20 12 15 14 15 13 10 6
South 4 7 3 5 16 21 19 10 4 5 10 3
East 5 10 4 9 12 8 14 11 3 7 4 6
West 4 7 6 5 11 4 13 32 6 9 15 13
Central 3 10 5 8 13 14 13 11 5 7 8 6

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 12 Jun 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 51 52 52 52 45 45 43 47 46 52 53 53
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 44 33 24 30 39 48 53 53 51 42 34 34



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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