South Carolina air quality today

A large share of the smoke South Carolina measures was set deliberately. The pine country across the coastal plain and the Sandhills is managed with fire, and the state built an approval process around that rather than a prohibition. Burning for forestry, wildlife and agricultural purposes is exempt from the open-burning regulation only where it follows the smoke management guidelines the South Carolina Forestry Commission administers, which in practice means reaching a Forestry Commission dispatcher before lighting and getting a decision that accounts for where the smoke will go.

Permitting and monitoring sit elsewhere, with the Bureau of Air Quality inside the South Carolina Department of Environmental Services, which writes the open-burning rules the forestry exemption is carved out of. One agency draws the line and another decides, burn by burn, who is allowed across it.

Warm-season readings are usually about ozone instead, and the state supplies the ingredients: long hot afternoons, heavy truck traffic on the I-26 and I-85 corridors, and the drayage and vessel movements around the port at Charleston. The Upstate adds terrain, sitting below the Blue Ridge escarpment where air pushes up against rising ground. Prescribed smoke travels as a plume with a direction, and a monitor either sits in that plume or does not. On a burn day a South Carolina number describes the air at one station, and the dispatcher who approved that burn was working from where the wind was going, not from where the station is.