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Pollutant Concentrations

Readings on 18 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 5(3) 31(31) 25(-) 40(17) 0.4(4) 19(58)
South 8(5) 31(31) 8(-) 25(11) 0.5(5) 17(57)
East 8(5) 24(24) 7(-) 58(25) 0.5(5) 17(56)
West 22(14) 40(40) 41(-) 38(16) 0.5(5) 24(65)
Central 6(4) 27(27) 22(-) 52(22) 0.4(4) 15(54)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 14 16 11 16 28 25 12 12 21 22 14 12
South 5 8 9 7 12 9 11 11 13 19 33 41
East 15 10 11 17 16 16 15 11 12 13 13 19
West 15 19 19 15 10 12 15 18 21 24 20 26
Central 11 7 12 8 8 16 23 13 12 9 19 8
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 16 19 21 23 17 11 23 37 20 23 19 16
South 38 58 25 30 16 27 8 6 8 3 11 10
East 24 29 22 21 26 19 17 16 14 13 18 14
West 24 30 31 45 45 37 44 21 18 26 25 24
Central 25 23 19 19 27 26 7 16 16 15 8 9

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 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 44 47 51 51 52 54 55 54 54 55 57 59
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 62 67 68 69 66 66 63 61 58 56 55 55



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.

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