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Pollutant Concentrations

Air quality readings will be available hourly from 1am to 12am..

 

Readings on 04 Nov 2014

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 14(9) 68(59) 57(-) 35(15) 0.3(3) 47(91)
South 9(5) 58(54) 38(-) 34(14) 0.5(5) 48(91)
East 8(5) 47(47) 17(-) 56(24) 0.3(3) 39(82)
West 22(14) 67(59) 64(-) 40(17) 0.5(5) 51(95)
Central 18(12) 53(52) 47(-) 60(25) 0.6(6) 40(83)

1-hr PM2.5 (µg/m3)b Readings on 03 Nov 2014

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 57 59 60 72 67 48 59 58 82 65 59 46
South 75 67 53 44 45 50 68 72 78 100 60 60
East 57 44 46 39 39 42 53 51 67 54 41 33
West 74 73 70 63 68 71 79 75 80 89 79 52
Central 69 65 50 42 45 42 37 54 62 65 41 26
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 51 38 34 30 29 29 32 32 26 24 31 38
South 43 45 26 30 19 33 29 28 18 30 27 42
East 30 34 35 32 23 33 37 29 23 26 30 43
West 37 28 20 25 24 28 26 27 25 34 36 41
Central 27 38 28 22 21 34 30 34 30 30 31 36

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 03 Nov 2014

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 115 111 107 102 98 96 99 103 111 116 114 104
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 89 82 76 72 67 68 70 72 70 69 69 75

Hourly updates of 3-hr PSI readings are provided from 1am to 12am. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.

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