The Environmental Protection Agency has issued an air quality alert, noting high amounts of ozone in the air.
A Code Orange alert has been issued. That means the air quality may be unhealthy for sensitive groups including active children and adults and people with lung disease, like asthma, should reduce prolonged or heavy exertion outdoors.
http://accesswdun.com/article/2018/5/668763/epa-issues-code-orange-air-alert-for-wednesday