Unlike a lot of Midwestern, Eastern and Gulf Coast haze, this involved little or no industrial pollution. The day before, a tremendous haboob began with convection in the mountains northeast of Las Cruces, NM, and swept over most of southern New Mexico into southeastern Arizona, contributing to wrecks on I-10 that snarled traffic for hours, and lofting countless millions of tons of dust airborne. The west-southwestward-surging outflow complex would peter out across Sonora and the Gulf of California during the early morning, but left behind fine particles of suspended dust still in the boundary layer. Over that, smoke moved in, following a big, looping, anticyclonic low/middle-tropospheric trajectory from California wildfires, across the Great Basin and central Rockies, then southward and southwestward to these parts. The dust-smoke combination made this haze, more densely obscuring progressively higher ridges and ranges in the distance. The haze lingered for the rest of the day until more monsoonal storms helped to clear it out in the evening.
14 NE Sunizona AZ (12 Jul 21) Looking SW
32.0424, -109.4837