Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Readings on 13 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 5(3) 22(22) 34(-) 12(5) 0.5(5) 13(52)
South 11(7) 20(20) 12(-) 7(3) 0.3(3) 12(50)
East 12(7) 15(15) 27(-) 21(9) 0.6(6) 10(40)
West 27(17) 25(25) 31(-) 22(9) 0.5(5) 13(52)
Central 9(6) 16(16) 25(-) 15(6) 0.4(4) 10(40)

1-hr PM2.5 (µg/m3)b Readings on 12 May 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 5 6 6 9 6 7 7 12 15 13 19 18
South 10 6 8 6 8 6 10 12 13 15 14 13
East 7 6 6 8 5 7 8 6 9 15 15 11
West 7 12 10 8 10 6 13 7 11 17 23 18
Central 6 5 7 5 7 7 5 14 12 11 14 14
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 17 11 16 14 12 17 18 18 16 14 16 16
South 9 13 14 14 15 15 14 15 17 17 13 10
East 6 14 12 13 10 11 11 10 11 6 12 10
West 12 17 20 21 23 10 8 11 14 11 11 12
Central 7 15 12 15 13 11 13 8 7 6 6 8

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 12 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 35 33 30 30 30 29 31 35 43 51 53 55
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 53 52 52 54 54 53 53 52 52 51 50 47



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