It Hit 700 News Today : Breaking News, Live Updates & Top Stories | Vimarsana

soon. plus, all eyes on florida where a grand jury in the trump classified documents case heard from another witness today. "the washington post" reporting that if trump is indicted, a majority of the charges will be brought in florida. so what does that mean? and ukraine gaining background around bakhmut around the chief of russia's private army admits there will be major russian losses in ukraine. good evening, i'm erin burnett. "outfront" tonight, the hazardous air now choking more than 75 million americans. it's an unbelievable situation. these are live pictures of new york...

Studies showing emergency visits to the e.r. go up on days like this. how dangerous is it really to be breathing this air in? >> well, erin, thanks so much for having me on the show. this is an extraordinary event. those of us who study this topic, study particles and the health effects, the health limits about 12 microgram per cubic meter. we get excited if we see 50 or 100. it hit 700 today. that's like the worst air pollution day in beijing. that's like you can't see down the end of the runway. never seen anything like this. i'm from new york, too. and when these events happen, certainly pe...

That at the admissions to emergency departments for asthma doubled when the outdoor pollution levels hit 50 micrograms per cubic meter. today it hit over 700. so this is as serious as an air pollution event as it can get. >> it's incredible. and, frankly, just as a regular citizen, i don't think we had any sense of how quickly or how bad it would be. the mayor of new york city is not alone in telling people to stay home. you're hearing that across many of the affected areas including philadelphia. but you say that's not the answer. >> reporter: i think it's good advice, but the dirty secret of...