National Environment Agency Our Environment
print Home Anti-Pollution & Radiation Protection Air Pollution Control PSI Pollutant Concentrations

Pollutant Concentrations

Readings on 04 Jul 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) 35(35) 45(-) 39(16) 0.5(5) 23(63)
South 10(6) 36(36) 11(-) 35(15) 0.4(4) 23(63)
East 11(7) 31(31) 14(-) 44(18) 0.5(5) 22(62)
West 60(38) 41(41) 28(-) 42(18) 0.8(8) 26(67)
Central 14(9) 34(34) 39(-) 36(15) 0.3(3) 19(59)

1-hr PM2.5 (µg/m3)b Readings on 03 Jul 2015

View reading for:

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
North 27 18 13 17 17 18 21 19 25 32 26 31
South 32 18 21 15 18 16 22 23 20 30 30 21
East 18 19 18 16 21 21 21 22 16 22 24 31
West 25 21 18 17 17 18 22 18 26 27 35 33
Central 16 18 20 16 16 16 19 16 19 17 21 25
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
North 31 35 31 34 25 23 25 22 18 16 19 13
South 20 26 15 29 32 25 22 16 30 16 24 27
East 22 30 27 27 25 33 25 23 15 19 21 18
West 28 35 31 26 27 24 32 36 31 24 31 32
Central 28 26 22 23 26 19 26 22 13 12 8 14

Note:
a Sub-index for nitrogen dioxide is reported only when the 1-hour concentration exceeds 1130 µg/m3.
b There is no sub-index for 1-h PM2.5.

3-hr PSI Readings from 1am to 12am on 03 Jul 2015

Time 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm
3-hr PSI 68 64 60 57 57 57 59 59 61 62 65 68
Time 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
3-hr PSI 68 69 68 69 68 67 67 65 64 61 60 60



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.

image description