Action and Limit Levels for Air Quality
Action and Limit
Levels for 1-Hour TSP
|
Location |
Action
Level, mg/m3 |
Limit
Level, mg/m3 |
|
MA1 |
425 |
500 |
|
MA2 |
412 |
|
|
MA3 |
424 |
|
|
MA4 |
425 |
|
|
MA5 |
428 |
Action and Limit
Levels for 24-Hour TSP
|
Location |
Action
Level, mg/m3 |
Limit
Level, mg/m3 |
|
MA1 |
166 |
260 |
|
MA2 |
156 |
|
|
MA3 |
154 |
|
|
MA4 |
149 |
|
|
MA5 |
151 |
Action and Limit Levels for Noise
|
Time
Period |
Action |
Limit |
|
0700-1900 hrs on
normal weekdays |
When
one documented complaint is received |
75*dB(A) |
|
0900-1900 hrs
on general holiday including Sundays & 1900-2100 hrs on any day not being
a general holiday |
60dB(A) |
* Reduce to 70dB(A) for schools and
65dB(A) during school examination periods
Day-Time
Baseline Noise Level
|
Daytime 0700-1900 hrs on normal weekdays |
|
||
|
Leq |
L10 |
L90 |
|
|
MN1 |
63.3 (53.6 – 71.1) |
65.1 (54.4 – 74.4) |
61.3 (52.3 – 68.8) |
|
MN2 |
70.2 (60.0 – 80.2) |
72.5 (63.2 – 85.9) |
66.4 (54.0 – 71.5) |
|
MN3 |
69.0 (66.1 – 73.7) |
71.4 (68.3 – 75.2) |
65.9 (62.6 – 71.6) |
|
MN4 |
66.4 (63.2 – 72.1) |
68.4 (64.9 – 75.3) |
63.3 (60.7 – 70.4) |
|
MN5 |
60.9 (56.6 – 71.5) |
63.7 (58.9 – 75.4) |
55.4 (51.1 – 69.4) |
|
MN6 |
61.0 (56.0 – 72.5) |
63.8 (58.2 – 75.5) |
56.3 (51.6 – 69.4) |
|
MN7 |
56.1 (39.6 – 66.0) |
59.6 (40.6 – 69.2) |
47.0 (33.1 – 57.5) |
|
MN8 |
59.8 (49.0 – 72.3) |
62.5 (50.0 – 74.9) |
55.8 (48.0 – 68.2) |
|
MN9 |
67.7 (58.4 – 74.1) |
71.7 (60.4 – 77.9) |
55.8 (46.8 – 68.4) |
|
MN10 |
71.9 (68.9 – 77.2) |
75.5 (72.4 – 81.0) |
58.0 (54.2 – 58.0) |
Evening-Time Baseline Noise Level
|
Evening Time 0700-2300 hrs on holidays; and 19:00-23:00 hrs on all other days |
|
||
|
Leq |
L10 |
L90 |
|
|
MN1 |
61.3 (51.4 – 71.1) |
63.0 (53.2 – 75.2) |
59.0 (48.4 – 66.7) |
|
MN2 |
66.5 (57.2 – 74.4) |
69.0 (59.0 – 75.7) |
61.8 (36.8 – 68.6) |
|
MN3 |
66.7 (64.0 – 72.0) |
69.2 (65.8 -
74.9) |
63.5 (60.6 – 69.4) |
|
MN4 |
63.3 (61.2 – 71.4) |
65.0 (62.5 – 72.0) |
61.0 (59.5 – 70.5) |
|
MN5 |
57.0 (50.9 – 71.6) |
58.5 (53.2 – 74.0) |
52.5 (47.0 – 69.0) |
|
MN6 |
56.8 (52.4 – 72.5) |
58.6 (53.7 – 75.0) |
53.4 (49.6 – 69.2) |
|
MN7 |
56.7 (38.9 – 70.7) |
60.1 (41.4 – 75.0) |
49.2 (33.4 – 62.6) |
|
MN8 |
58.9 (50.1 – 68.4) |
61.3 (51.1 – 76.3) |
54.3 (48.0 – 67.0) |
|
MN9 |
66.1 (48.1 – 73.7) |
70.5 (49.0 – 76.5) |
54.0 (46.0 – 69.5) |
|
MN10 |
61.3 (55.9 – 78.9) |
63.5 (58.1 – 81.3) |
56.9 (51.8 – 75.6) |
Night-Time Baseline
Noise Level
|
Night Time 2300-07:00 hrs of next days |
|
||
|
Leq |
L10 |
L90 |
|
|
MN1 |
64.0 (50.6 – 74.9) |
65.6 (52.2 – 78.7) |
61.9 (48.0 – 71.7) |
|
MN2 |
62.6 (55.1 – 76.4) |
65.5 (57.0 – 76.5) |
56.5 (50.5 – 73.5) |
|
MN3 |
61.6 (57.2 – 68.5) |
64.4 (58.6 – 72.3) |
57.3 (54.6 – 64.1) |
|
MN4 |
61.4 (59.4 – 70.6) |
62.5 (60.0 – 72.0) |
60.0 (58.5 – 69.5) |
|
MN5 |
54.2 (46.3 – 77.2) |
56.0 (48.7 – 78.0) |
48.5 (43.0 – 71.0) |
|
MN6 |
54.2 (46.3 – 77.2) |
56.3 (48.7 – 78.0) |
50.9 (43.2 – 73.8) |
|
MN7 |
56.7 (38.7 – 70.6) |
60.2 (40.9 – 75.3) |
48.3 (32.6 – 61.7) |
|
MN8 |
58.5 (47.5 – 70.9) |
60.2 (48.4 – 71.9) |
55.5 (45.4 – 68.3) |
|
MN9 |
64.4 (54.7 – 72.6) |
68.5 (52.5 – 77.5) |
51.5 (44.5 – 66.5) |
|
MN10 |
58.1 (50.6 – 79.3) |
60.8 (52.9 – 82.2) |
53.0 (46.8 – 75.8) |
Action and Limit Levels for Water Quality
Calculated Action and Limit Levels (Ebb Tide)
|
Monitoring Station |
Upstream Control Station |
DO, Surface &
Middle (mg/L) |
DO, Bottom (mg/L) |
Turbidity (NTU) |
SS (mg/L) |
||||||||
|
Ebb |
Action |
Limit |
Action |
Limit |
Action |
Limit |
Action |
Limit |
|||||
|
MW1 |
MC1 |
3.88 |
3.29 |
3.90 |
3.35 |
13.29 |
or 120% of upstream control station's Tby
at the same tide of the same day |
18.37 |
or 130% of upstream control station's Tby at
the same tide of the same day |
11.5 |
or 120% of upstream control station's SS at
the same tide of the same day |
20.0 |
or
130% of upstream control station's SS at the same tide of the same day |
|
MW2 |
|||||||||||||
|
MW3 |
|||||||||||||
|
MW4 |
|||||||||||||
|
MW5 |
|||||||||||||
|
MW6 |
|||||||||||||
|
WFCZF1 |
4.91 |
4.24 |
4.66 |
4.03 |
16.70 |
23.12 |
13.1 |
14.1 |
|||||
Notes:
·
All
the figures given in the table are used for reference only and the EPD may
amend the figures whenever it is considered necessary.
Calculated
Action and Limit Levels (Flood Tide)
|
Monitoring Station |
Upstream Control Station |
DO, Surface &
Middle (mg/L) |
DO, Bottom (mg/L) |
Turbidity (NTU) |
SS (mg/L) |
||||||||
|
Flood |
Action |
Limit |
Action |
Limit |
Action |
Limit |
Action |
Limit |
|||||
|
MW1 |
Nil |
5.20 |
4.72 |
5.00 |
4.65 |
14.55 |
or 120% of upstream control station's Tby
at the same tide of the same day |
28.86 |
or 130% of upstream control station's Tby at
the same tide of the same day |
18.6 |
or 120% of upstream control station's SS at
the same tide of the same day |
23.4 |
or
130% of upstream control station's SS at the same tide of the same day |
|
MW2 |
|||||||||||||
|
MW3 |
11.50 |
12.80 |
9.9 |
11.5 |
|||||||||
|
MW4 |
|||||||||||||
|
MW5 |
MR5 |
14.55 |
28.86 |
18.6 |
23.4 |
||||||||
|
MW6 |
MR6 |
||||||||||||
|
WFCZF1 |
Nil |
5.01 |
5.00 |
4.69 |
4.55 |
20.07 |
21.61 |
17.1 |
18.1 |
||||
Notes: All the figures given in the table are
used for reference only and the EPD may amend the figures whenever it is
considered necessary.