There should be a UV predicted index for the next day, and Ozone/Particulates predictions plus current readings. Just seeing UV and humidity does not tell you if the air is breathable or has high ozone or not, or if there is a health hazard warning issued by the EPA or not for the day in regard to ozone and particulates. AIRNOW.GOV is an EPA website, and gives this information. Just a friendly suggestion!!
Unfortunately, I can only work with the data that weather.com offers. You should definitely contact those folks and pass on your suggestion.