Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Readings on 23 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 6(4) 32(32) 8(-) 34(14) 0.5(5) 21(61)
South 40(25) 30(30) 54(-) 38(16) 0.5(5) 20(60)
East 18(11) 29(29) 24(-) 44(19) 0.7(7) 22(62)
West 6(4) 24(24) 16(-) 64(27) 0.4(4) 14(53)
Central 18(11) 28(28) 54(-) 26(11) 0.5(5) 18(58)

1-hr PM2.5 (µg/m3)b Readings on 22 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 14 6 11 14 10 15 15 22 22 29 20 27
South 17 8 12 24 20 13 16 12 18 25 14 17
East 19 20 14 14 18 15 16 11 18 24 16 21
West 9 6 4 11 11 9 11 13 16 17 20 18
Central 17 14 10 13 17 12 12 18 23 13 17 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 14 22 18 21 23 25 25 30 18 13 19 17
South 12 14 17 31 33 34 31 36 18 26 6 14
East 17 21 27 29 35 28 34 32 24 21 19 26
West 19 13 20 14 24 18 27 13 7 7 5 10
Central 20 21 21 17 35 26 36 23 17 13 11 11

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 22 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 56 54 50 50 52 54 53 53 56 59 59 59
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 58 58 60 65 67 70 69 65 60 54 54



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.

Back to Top