Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Readings on 31 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 8(5) 25(25) 21(-) 28(12) 0.3(3) 15(54)
South 14(9) 37(37) 6(-) 20(9) 0.3(3) 14(53)
East 6(4) 21(21) 4(-) 29(12) 0.4(4) 14(54)
West 5(3) 28(28) 21(-) 39(16) 0.4(4) 13(52)
Central 5(3) 23(23) 6(-) 34(14) 0.2(2) 11(45)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 4 6 13 17 21 20 16 12 11 15 20 16
South 10 14 13 11 16 15 15 20 19 14 10 17
East 9 8 15 19 17 14 11 12 10 11 19 21
West 8 14 9 4 14 8 4 15 18 18 20 21
Central 11 14 13 7 4 5 5 9 13 12 16 15
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 13 18 14 15 7 15 15 13 10 12 17 12
South 18 20 24 20 15 16 6 6 8 8 9 10
East 20 17 10 11 15 19 12 20 12 12 16 18
West 16 16 18 21 14 16 11 9 7 13 11 14
Central 16 12 15 11 12 13 7 12 7 9 10 14

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 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 46 45 45 49 52 52 51 51 52 53 54 56
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 57 57 56 56 54 54 52 52 43 44 45 51



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