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Pollutant Concentrations

Readings on 04 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 9(6) 32(32) 27(-) 47(20) 0.5(5) 18(58)
South 46(29) 55(53) 4(-) 50(21) 0.5(5) 21(61)
East 28(18) 30(30) 21(-) 70(30) 0.6(6) 23(63)
West 14(9) 27(27) 22(-) 61(26) 0.4(4) 15(54)
Central 23(14) 30(30) 68(-) 47(20) 0.3(3) 20(60)

1-hr PM2.5 (µg/m3)b Readings on 03 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 17 17 24 22 23 25 9 16 15 9 11 15
South 16 13 19 18 18 11 3 16 29 1 5 27
East 27 23 26 19 21 19 11 13 12 8 6 21
West 15 17 18 12 10 11 7 13 8 12 15 17
Central 19 16 17 20 15 12 10 11 7 14 9 27
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 26 21 21 24 22 18 31 28 5 7 12
South 33 29 29 28 30 42 52 20 39 7 2 13
East 12 15 27 23 26 41 50 55 50 24 7 12
West 25 22 30 21 18 21 24 22 17 4 3 4
Central 23 22 27 28 26 34 45 38 36 10 7 15

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 03 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 60 58 59 58 58 57 53 52 50 51 45 52
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 62 64 65 66 68 73 76 77 66 56 36



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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