Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Readings on 11 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) 20(20) 29(-) 15(6) 0.5(5) 10(42)
South 13(8) 20(20) 9(-) 16(7) 0.3(3) 12(48)
East 11(7) 17(17) 13(-) 33(14) 0.4(4) 10(42)
West 24(15) 24(24) 19(-) 33(14) 0.5(5) 13(52)
Central 7(4) 19(19) 12(-) 21(9) 0.4(4) 9(38)

1-hr PM2.5 (µg/m3)b Readings on 10 May 2015

View reading for:

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

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 10 May 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 42 36 33 34 35 39 39 37 37 40 44 42
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 41 39 44 46 51 49 47 44 49 53 53 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