Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Readings on 31 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 3(2) 18(18) 29(-) 14(6) 0.3(3) 8(35)
South 12(7) 19(19) 6(-) 15(6) 0.3(3) 7(30)
East 8(5) 15(15) 11(-) 28(12) 0.5(5) 8(34)
West 21(13) 23(23) 27(-) 17(7) 0.3(3) 11(46)
Central 8(5) 17(17) 24(-) 20(8) 0.2(2) 8(33)

1-hr PM2.5 (µg/m3)b Readings on 30 May 2015

View reading for:

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

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 30 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 25 24 23 21 24 23 24 26 27 37 43 51
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 48 48 50 51 51 44 39 35 36 34 34 31



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