Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Readings on 18 Apr 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 6(4) 30(30) 8(-) 10(4) 0.4(4) 17(56)
South 21(13) 24(24) 23(-) 25(11) 0.3(3) 12(49)
East 8(5) 18(18) 6(-) 41(17) 0.5(5) 12(49)
West 3(2) 30(30) 11(-) 39(17) 0.4(4) 17(57)
Central 9(6) 26(26) 23(-) 37(16) 0.3(3) 14(53)

1-hr PM2.5 (µg/m3)b Readings on 17 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 14 17 22 23 26 25 16 16 10 21 17 13
South 10 8 12 11 12 12 14 14 15 10 7 12
East 9 10 10 10 9 12 10 13 16 18 11 16
West 18 19 38 28 19 17 15 17 20 21 21 18
Central 7 14 15 16 9 19 31 23 19 16 13 18
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 10 11 14 13 16 8 20 21 20 16 15 16
South 13 20 12 13 14 15 10 5 10 11 14 6
East 14 15 11 15 9 11 7 17 5 10 11 15
West 20 16 15 14 12 5 16 12 7 16 20 12
Central 17 16 13 14 12 15 10 13 4 6 8 5

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 17 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 47 51 54 56 57 56 56 56 56 56 55 55
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 54 54 54 53 52 51 50 51 49 48 48 50



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