Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Readings on 28 Mar 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 7(4) 22(22) 19(-) 32(14) 0.3(3) 12(49)
South 13(8) 27(27) 9(-) 26(11) 0.3(3) 15(54)
East 6(4) 20(20) 4(-) 35(15) 0.3(3) 12(51)
West 3(2) 30(30) 21(-) 37(16) 0.4(4) 14(54)
Central 8(5) 28(28) 14(-) 42(18) 0.2(2) 12(51)

1-hr PM2.5 (µg/m3)b Readings on 27 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 16 8 9 13 14 14 13 11 11 8 14 10
South 7 6 9 12 12 9 13 17 19 22 26 19
East 8 13 9 8 13 14 13 12 9 10 20 19
West 15 17 21 10 12 11 16 15 20 20 22 16
Central 11 11 6 16 9 11 15 19 26 17 13 11
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 9 15 9 13 11 7 14 17 17 13 6 10
South 20 17 13 14 13 10 15 20 17 19 14 10
East 19 6 11 19 11 8 8 20 14 13 10 8
West 12 20 10 17 15 11 14 11 7 7 13 13
Central 11 9 7 13 9 12 12 14 8 14 9 7

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 27 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 46 46 46 47 49 50 52 53 55 55 57 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 53 51 52 51 51 48 52 53 53 50 46



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