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Pollutant Concentrations

Readings on 30 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 4(2) 26(26) 20(-) 21(9) 0.5(5) 14(53)
South 15(10) 24(24) 45(-) 21(9) 0.4(4) 14(53)
East 10(6) 27(27) 12(-) 32(13) 0.4(4) 18(57)
West 4(3) 26(26) 25(-) 32(14) 0.5(5) 13(52)
Central 5(3) 24(24) 38(-) 20(9) 0.4(4) 15(54)

1-hr PM2.5 (µg/m3)b Readings on 29 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 16 11 17 19 22 22 28 22 23 20 23 8
South 17 14 8 13 6 17 13 12 19 25 23 7
East 19 21 21 37 34 27 18 27 27 30 26 19
West 7 8 11 9 5 7 9 18 19 22 16 22
Central 14 8 11 13 11 17 19 24 25 24 18 15
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 9 12 12 9 7 10 6 8 10 6 9 10
South 8 7 18 23 8 20 19 13 14 7 8 13
East 15 9 17 8 5 10 10 7 6 8 10 9
West 10 14 14 18 12 19 21 14 6 11 9 11
Central 19 8 12 14 11 17 18 8 10 12 10 18

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 29 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 47 52 53 54 55 57 57 58 60 63 63 60
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 51 51 52 51 52 52 52 47 38 37 42



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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