Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Readings on 24 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 4(3) 27(27) 20(-) 23(10) 0.3(3) 18(57)
South 6(4) 29(29) 3(-) 40(17) 0.4(4) 16(56)
East 6(4) 24(24) 4(-) 58(25) 0.5(5) 17(57)
West 3(2) 34(34) 9(-) 76(32) 0.4(4) 22(62)
Central 5(3) 28(28) 36(-) 54(23) 0.4(4) 18(58)

1-hr PM2.5 (µg/m3)b Readings on 24 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 22 19 19 16 19 17 19 24 23 15 19 20
South 12 12 22 19 15 16 13 13 13 27 17 18
East 17 15 19 17 19 13 18 15 16 19 18 24
West 21 22 21 25 14 28 18 21 29 25 21 23
Central 22 18 19 14 19 16 16 17 19 14 17 13
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 24 22 20 11 21 18 14 18 9 13 9 -
South 25 18 21 22 22 24 17 10 7 7 5 -
East 25 19 11 19 18 19 23 17 10 9 16 -
West 32 17 22 25 21 23 24 17 16 18 18 -
Central 25 21 17 13 28 22 19 18 14 16 17 -

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 24 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 61 59 58 58 58 58 57 57 58 59 59 59
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 61 62 61 58 59 60 61 59 55 52 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