I’ve been playing around with the NIOSH SLM app on my phone. It’s an app that measures sound levels to make sure they’re safe. One of the things it measures is LAeq. I’ve tried to figure out what that’s measuring both in the app and on Google but none of the answers I get have been straightforward. It says “equivalent (averaged every second) continuous sound level in A-weighted decibels dB(A)”. I’m struggling to understand precisely what it means by that. Is this just an average of the decibel level in the given time, or is there more to it? Why would I want to measure this otherwise? And what is a safe reading for LAeq?