Extreme heat waves are breaking out all across the country, and some environmental activists are questioning whether this unprecedented summer is making the EPA's air pollution regulations obsolete.On today's episode of our environmental podcast, Parts Per Billion, Bloomberg Law's Jennifer Hijazi explains how high heat can both trigger more pollutant emissions and also intensify the pollution already in the air. And she explains why the EPA's cap-and-trade system for managing these pollutants is having trouble keeping up.Have feedback on this episode of Parts Per Billion? Give us a call and leave a voicemail at 703-341-3690. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.