Re: the dBA testing, the only testing procedure i could find (as of yet) published by a government procedure is the Burnaby noise bylaw; a couple points are stated at the end of the document in Schedule A
https://bylaws.burnaby.ca/en/permalink/bylaw24796
Quote:
SCHEDULE A
(1) All sound levels shall be determined with a sound level meter on the “A” scale and “slow” meter reading.
(2) Sound level meters shall be used and operated in accordance with manufacturers' instructions. The sound level meter shall be calibrated before and after readings have been taken.
(3) When determining the sound level from a source the ambient or background noise or sound level shall be established at the appropriate position and during the relevant period of time wherever possible before taking sound measurements from the source. No measurement should be attempted if the difference is 3 db or less.
(4) Noise or sound measurement should, in general, be made at a height of approximately one (1) metre and a distance of three (3) metres from any wall, building, or other reflecting structure with the microphone appropriately oriented.
(5) Precautions shall be taken to ensure that the values recorded correspond to the noise or sound being investigated and are not due to wind, or extraneous sources.
(6) When the wind velocity is above eight (8) kilometres per hour, a wind screen must be used. No test should be attempted when the wind velocity is above forty (40) kilometres per hour.
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And since my place of work is in Bby, i just follow this procedure when needed. It’s near impossible to have an accurate measurement on roadside due to wind or other extraneous noises. It’s already hard enough to do inside a shop environment