Action / Limit Levels for Air Quality
|
Parameters |
Action Level |
Limit Level |
|
24-hour TSP Level in µg/m3 |
1For baseline level ≤ 200 µg/m3,
Action level = (baseline level * 1.3 + Limit level)/2; For baseline level
> 200 µg/m3 Action level = Limit level |
260 µg/m3 |
|
1-hour TSP Level in µg/m3 |
2For baseline level ≤ 384 µg/m3, Action level
= (baseline level * 1.3 + Limit level)/2; For baseline level > 384 µg/m3,
Action level = Limit level |
500 µg/m3 |
1. The Action Level for
24-hour TSP Level:
a) AMS 2 = (71.1*1.3 + 260)
/ 2 = 176 µg/m3; b) AMS 3C = (56.9*1.3 +
260) / 2 = 167 µg/m3;
c) AMS 6 = (66.4*1.3 + 260)
/ 2 = 173 µg/m3; d) AMS 7B = (82.3*1.3 + 260) / 2 = 183 µg/m3;
2. The Action Level for
1-hour TSP Level:
a) AMS 2 = (191.5*1.3 +
500) / 2 = 374 µg/m3; b) AMS 3C = (18.2.2*1.3 +
500) / 2 = 368 µg/m3;
c) AMS 6 = (169.2*1.3 +
500) / 2 = 360 µg/m3; d) AMS 7B = (184.2*1.3 + 500) / 2 = 370 µg/m3;
Action and Limit Levels for Construction Noise
|
Time Period |
Action Level |
Limit Level |
|
0700 - 1900 hours on normal weekdays |
When one documented complaint is received |
75 dB(A) * |
Note : If works are to be carried out during restricted hours, the conditions stipulated in the construction
noise permit issued by the Noise Control Authority have to be followed.
* Reduce to 70 dB(A) for schools and
65 dB(A) during school examination periods.
Action and Limit Levels for
Chinese White Dolphin Monitoring – Approach to Define Action
Level (AL) and Limit Level (LL)
|
|
North
Lantau Social Cluster |
|
|
NEL |
NWL |
|
|
Action Level |
(STG < 70% of baseline) & (ANI < 70% of baseline) |
(STG < 70% of baseline) & (ANI < 70% of baseline) |
|
Limit Level |
[(STG < 40% of baseline) & (ANI < 40% of baseline)]
AND [ (STG < 40% of baseline) & (ANI < 40% of baseline)] |
|
Remark: For North
Lantau Social Cluster, action level will be trigger if either NEL or NWL fall
below the criteria; limit level will be triggered if both NEL and NWL fall
below the criteria.
Derived Value of Action Level (AL) and Limit Level (LL) for
Chinese White Dolphin Monitoring
|
|
North
Lantau Social Cluster |
|
|
NEL |
NWL |
|
|
Action Level |
(STG < 4.2) & (ANI < 15.5 ) |
(STG < 6.9) & (ANI < 31.3) |
|
Limit Level |
[(STG < 2.4) & (ANI <8.9)] AND [ (STG < 3.9) &
(ANI < 17.9)] |
|