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Pollutant Concentrations

Readings on 27 Mar 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 8(5) 24(24) 15(-) 37(16) 0.3(3) 14(53)
South 10(6) 26(26) 13(-) 25(10) 0.3(3) 12(51)
East 6(4) 21(21) 4(-) 42(18) 0.4(4) 14(53)
West 4(3) 30(30) 16(-) 44(19) 0.4(4) 17(56)
Central 6(4) 27(27) 26(-) 39(17) 0.3(3) 14(54)

1-hr PM2.5 (µg/m3)b Readings on 26 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 18 18 13 12 12 12 23 14 17 16 12 15
South 6 11 5 9 7 15 9 15 20 11 25 21
East 11 5 14 10 13 11 12 15 12 13 18 19
West 18 24 27 14 9 16 5 14 18 24 18 26
Central 12 7 17 9 10 18 18 16 12 12 12 7
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 14 17 13 17 16 7 11 8 9 15 11
South 18 21 16 23 20 17 9 2 3 6 2 8
East 18 19 14 14 15 16 14 12 11 17 8 12
West 19 15 17 18 22 18 15 12 9 14 14 12
Central 18 17 16 18 23 18 18 15 11 15 16 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 26 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 42 48 53 52 51 50 52 53 54 55 55 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 57 56 56 57 58 56 52 43 43 44 47



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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