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Pollutant Concentrations

Readings on 23 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(2) 37(37) 11(-) 40(17) 0.5(5) 22(62)
South 6(4) 36(36) 23(-) 44(19) 0.6(6) 24(64)
East 8(5) 32(32) 8(-) 35(15) 0.6(6) 26(66)
West 4(3) 38(38) 39(-) 55(23) 0.6(6) 27(67)
Central 4(3) 35(35) 83(-) 38(16) 0.7(7) 23(63)

1-hr PM2.5 (µg/m3)b Readings on 22 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 21 31 20 20 25 26 32 29 16 10 13 21
South 21 17 17 27 33 30 23 16 28 37 42 44
East 23 23 24 35 29 29 32 32 32 24 30 33
West 28 25 23 25 27 25 20 36 43 41 31 36
Central 15 21 22 27 27 25 17 20 29 32 40 29
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 28 33 29 27 29 35 11 11 9 16 18 23
South 36 33 47 47 9 13 1 2 4 11 12 17
East 39 35 38 28 40 25 5 6 7 9 17 20
West 29 36 36 35 45 5 2 3 15 19 21 30
Central 30 28 35 34 42 21 3 6 11 10 12 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 22 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 63 63 62 64 66 68 67 67 68 69 71 72
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 74 74 76 77 77 70 59 41 27 39 52 56



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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