air pollution June 21, 2022 5:51 pm What Is an ‘Ozone Action Day'? Ozone is a beneficial gas in our atmosphere but when it’s highly concentrated at ground-level, it can have a harmful impact on our respiratory systems. Here’s what you need to know. US & World Videos 1:40 Democrats say Big Oil misled public for decades about climate change 1:45 NYPD enters Columbia University in riot gear to clear protest 4:28 ‘Apples Never Fall' and ‘Jurassic Park' star Sam Neill reveals his real name 3:21 Katy Perry's surprising regret about cheeseburger Met Gala look 2:28 King Charles returns to public duties amid cancer diagnosis
