Home   Haze Updates   Pollutant Concentrations

Pollutant Concentrations

Readings on 22 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) 45(45) 13(-) 53(22) 0.5(5) 29(71)
South 16(10) 41(41) 33(-) 63(27) 0.5(5) 28(69)
East 10(6) 37(37) 6(-) 64(27) 0.4(4) 29(70)
West 15(9) 51(51) 19(-) 69(29) 0.6(6) 36(78)
Central 6(3) 41(41) 40(-) 73(31) 0.5(5) 29(70)

1-hr PM2.5 (µg/m3)b Readings on 21 Mar 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 28 29 21 25 25 24 27 29 27 26 33 33
South 21 28 20 25 29 23 22 21 21 26 35 27
East 21 22 27 26 21 25 19 25 19 25 33 31
West 24 28 23 30 31 28 31 27 33 37 45 43
Central 26 23 28 21 20 22 20 23 26 23 26 35
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 36 41 40 48 39 33 20 20 33 18 25 27
South 33 49 50 51 44 32 27 17 12 21 23 20
East 40 42 44 53 43 33 30 25 24 25 25 20
West 46 48 57 67 54 42 33 26 24 34 27 24
Central 37 41 43 50 51 32 26 27 31 31 24 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 21 Mar 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 67 66 65 66 65 66 65 65 65 67 70 73
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 77 81 86 92 93 88 78 69 66 65 66 65



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