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Day-Night Noise Level    1/1, 1/3

Strutt|Criteria|Ratings|Sound Level|LDN calculates the Day-Night noise level `L_(DN)` and inserts it into the active row.

`L_(DN)` is calculated as:

`L_(DN)=10log(10^(L_D/10)+10^((L_N+10)/10))`, where:
`L_D` is the day noise level
`L_N` is the night noise level


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strutt@arup.com