Why is it so smoky in Austin on Friday?

AUSTIN (KXAN) — From Round Rock to southwest Austin, KXAN has received several reports of hazy, smoky conditions and a burning smell Friday morning.The Austin Fire Department confirmed it had personnel at a fire near Parmer Lane and McNeil Road. Officials with the Round Rock Independent School District sent a tweet saying there was "heavy smoke in the area," but classes weren't interrupted.Reports of smoke and haze have also come from areas of the Oak Hill area in southwest Austin, particu