North
South
East
West
Central
µg/m
3
1-hr PM
2.5
concentration
At 2am on 14 Jul 2017
PM
2.5
1-hr conc.
At 2am on 14 Jul 2017
PM
2.5
sub-index
Computed based on
24-hour
average PM
2.5
concentrations.
PM
10
sub-index
Computed based on
24-hour
average PM
10
concentrations.
SO
2
sub-index
Computed based on
24-hour
average Sulphur Dioxide concentrations.
O
3
sub-index
Computed based on
8-hour
average Ozone concentrations.
CO
sub-index
Computed based on
8-hour
average Carbon Monoxide concentrations.
NO
2
sub-index
Sub-index for nitrogen dioxide is reported only when the
1-hour
concentration equals or exceeds 1130 μg/m
3
.
PM
2.5
:
Particulate matter of 2.5 microns or smaller in diameter
PM
10
:
Particulate matter of 10 microns or smaller in diameter
SO
2
:
Sulphur Dioxide
O
3
:
Ozone
CO
:
Carbon Monoxide
NO
2
:
Nitrogen Dioxide