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Pollutant Concentrations

Readings on 14 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 6(4) 21(21) 38(-) 41(17) 0.4(4) 10(43)
South 16(10) 28(28) 32(-) 36(15) 0.4(4) 12(51)
East 6(4) 19(19) 6(-) 57(24) 0.5(5) 11(47)
West 5(3) 29(29) 9(-) 50(21) 0.4(4) 13(52)
Central 11(7) 27(27) 42(-) 50(21) 0.3(3) 11(47)

1-hr PM2.5 (µg/m3)b Readings on 13 Mar 2015

View reading for:

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

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 13 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 37 36 31 33 37 48 51 52 51 52 53 54
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 54 53 50 52 52 54 52 48 42 39 40



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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