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Pollutant Concentrations

Readings on 02 May 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) 32(32) 23(-) 32(14) 0.6(6) 18(57)
South 16(10) 27(27) 21(-) 36(15) 0.5(5) 17(57)
East 15(9) 26(26) 18(-) 41(17) 0.6(6) 20(59)
West 4(2) 27(27) 42(-) 46(19) 0.5(5) 16(55)
Central 9(6) 27(27) 46(-) 30(13) 0.5(5) 17(57)

1-hr PM2.5 (µg/m3)b Readings on 01 May 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 17 14 28 35 44 28 15 14 16 17 18 19
South 14 16 15 19 24 23 20 23 21 20 18 14
East 21 25 21 25 25 29 27 21 21 16 22 18
West 20 22 18 13 16 15 22 21 19 23 17 15
Central 18 21 15 21 19 23 22 18 17 14 20 16
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 26 29 18 18 21 29 8 5 9 7 8 6
South 11 4 13 28 15 22 26 13 9 14 13 22
East 15 12 28 28 18 39 21 5 9 7 8 9
West 16 19 17 13 11 12 12 12 9 11 12 16
Central 16 13 17 16 16 37 20 11 11 11 9 7

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 01 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 58 58 59 60 61 62 62 61 60 58 58 57
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 56 56 58 58 62 61 58 51 40 41 45



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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