Table 4 - Correction Factors to Obtain the Predicted Noise Level(PNL) from Sound Power Level at Given Distances
Distance (m)
Correction (dB(A))
0
17
1
17
2
20
3
21
4
23
5
24
6
24
7
25
8
26
9
27
10
29
11
30
12
30
13
31
14
32
15
33
16
33
17
34
18
34
19
35
20 to 21
36
22 to 24
37
25 to 26
38
27 to 29
39
30 to 32
40
33 to 36
41
37 to 39
42
40 to 43
43
44 to 48
44
49 to 53
45
54 to 59
46
60 to 65
47
66 to 72
48
73 to 79
49
80 to 87
50
88 to 96
51
97 to 107
52
108 to 118
53
119 to 130
54
131 to 144
55
145 to 159
56
160 to 175
57
176 to 193
58
194 to 214
59
215 to 236
60
237 to 260
61
261 to 288
62
289 to 317
63
318 to 351
64
352 to 387
65
388 to 427
66
428 to 472
67
473 to 521
68
522 to 575
69
576 to 635
70
636 to 700
71
2005
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Important notices
Last revision date: 28 April 2006
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