Never witnessed anything like this. i can t remember going through anything like this before. please stay safe. with us now is cnn meteorologist derek van dam. derek, why don t you give us a sense of what we re seeing and how long we re going to see it for? john, you heard athena talk about how this impacts asthmatic. today is not the day that you want to leave your inhaler or pump at home because it can literally save your life. it s been creating beautiful sunris sunrises and sunsets and when this settles to the earth and we start to breathe that toxic, toxic air which people describe to me in social media, as people say it is almost acrid and you can taste it. today is the global running day and the organization that runs that says that this is not the day to do that. not to recognize this day. you want to pick another day to recognize global running day because the air quality is the