Dear Greg, so it seems that your local government is setting LAeq, the A-weighted, equivalent sound level (average level) measured over 1-hour period. If you plan to use the NIOSH app, my suggestion is to run it for exactly one hour and report the LAeq value (third row). You can also press the LAeq and it will appear at the top for easier reading. Make sure you save the measurement(s) using the save button at the bottom after each 1-hour measurement so you have those records.