CHARLOTTE, N.C. – Heavy smog conditions in Charlotte forced a ground stop at Charlotte Douglas International Airport Tuesday morning.

The conditions were caused by patches of dense fog and smoke created by the wildfires burning in western North Carolina. Air quality advisories are currently in effect for the Charlotte area. The ground stop lasted for a little under an hour as visibility increased, a source at the airport told NBC Charlotte's Rachel Rollar.

According to AirNow, the Charlotte region is now in a "Code Orange," which means that people with heart or lung disease, older adults, and children should reduce prolonged or heavy exertion.

The airport tweeted the notice just after 7:30 a.m.

To see if your flight is delayed, check with your airline.