Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Readings on 20 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 11(7) 32(32) 32(-) 33(14) 1.2(12) 16(56)
South 34(21) 32(32) 65(-) 39(16) 0.5(5) 23(63)
East 16(10) 20(20) 20(-) 51(22) 0.8(8) 15(54)
West 20(13) 30(30) 13(-) 59(25) 0.5(5) 18(58)
Central 23(15) 28(28) 79(-) 46(19) 0.6(6) 18(58)

1-hr PM2.5 (µg/m3)b Readings on 19 Apr 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 12 16 13 13 19 17 7 17 5 4 3 13
South 9 10 11 19 9 8 22 10 4 2 21 17
East 10 13 12 13 8 9 13 14 4 3 10 8
West 17 17 20 19 15 12 5 4 16 22 29 27
Central 9 6 11 12 8 8 15 14 6 3 9 15
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 15 13 22 30 32 11 8 14 33 34 22 20
South 9 23 46 40 62 31 20 30 30 36 36 37
East 17 20 22 12 15 15 13 16 26 25 30 34
West 21 22 17 18 26 7 20 26 29 27 14 11
Central 21 20 35 50 41 16 16 23 20 25 36 23

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 19 Apr 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 48 50 51 53 52 51 48 48 43 35 39 51
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 55 57 62 67 73 68 63 57 62 67 69 68



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