This study documents actual levels of destruction, by taking readings of ozone and nitrogen oxide levels before and during the event. (earthobservatory.nasa.gov)
Keep in mind that mineral levels on a hair test are not actual levels in the body. (myersdetox.com)
When it comes to actual level design, some of the level are marvelous, some are okay, while one is actually pretty terribly designed. (waytoomany.games)