Interesting - is "average" noise level defined as a 5-minute Leq? I'm curious to see how you expand this to other metro areas. Arup has deep pockets but I susp

Interesting - is "average" noise level defined as a 5-minute Leq? I'm curious to see how you expand this to other metro areas. Arup has deep pockets but I suspect not deep enough to cover even most metro areas in the USA, and (unlike the EU) we Americans aren't really big on noise-mapping our cities.