TNAG-1613-FCO40-2221-Executive-Council-of-Hong-Kong-memoranda-and-minutes-of-meet-1987 — Page 236

1

18

Table 4

Summation of Noise Levels

Difference in dB(A)

between two noise

levels being summed |

Amount in dB(A) to add to the higher noise level

0 to 0.5

3.0

1.0 to 1.5

2.5

1

2.0 to 3.0

2.0

3.5 to 4.5

1.5

1

5.0 to 7.0

1.0

7.5 to 12.0

0.5

more than 12.0

0

Note: When using Table 4 noise levels should be summed in a pairwise

fashion and the final total rounded to the nearest whole dB(A),

with values of 0.5 or more being rounded upwards.