Every day in widespread forests around the globe, trees emit copious biogenic volatile organic compounds (BVOCs) into the warm forest air. These BVOCS are quickly broken down by atmospheric oxidation chemistry, creating small particles and initiating more atmospheric oxidation chemistry by producing the reactive gas hydroxyl (OH). Over the past decade, OH measurements have been two to ten times greater than modeled OH in warm forests. Do these discrepancies indicate fundamental flaws in the understanding of atmospheric chemistry in warm forests or are the OH measurements wrong?