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Pollutant Concentrations

Readings on 20 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) 11(-) 64(27) 0.5(5) 19(59)
South 13(8) 30(30) 8(-) 45(19) 0.5(5) 18(57)
East 10(6) 29(29) 7(-) 83(35) 0.6(6) 20(60)
West 21(13) 38(38) 24(-) 67(28) 0.5(5) 23(64)
Central 6(4) 31(31) 53(-) 49(21) 0.5(5) 19(59)

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

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 17 25 22 20 16 13 18 15 16 15 10 17
South 12 13 8 9 7 13 12 9 14 19 17 24
East 17 18 15 14 13 12 14 20 15 15 19 22
West 20 21 17 14 16 14 9 25 29 27 23 24
Central 20 14 13 13 10 19 13 8 12 9 15 23
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 22 21 26 26 34 27 25 20 16 9 18 19
South 38 29 26 30 28 24 15 8 15 13 18 20
East 28 34 25 30 28 30 23 17 16 22 15 23
West 31 32 27 34 31 28 34 17 17 24 24 26
Central 30 21 32 31 27 29 25 12 20 22 19 21

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 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 56 57 56 55 53 52 52 53 55 56 57 58
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 63 67 69 69 70 70 68 62 58 56 57 59



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.