These are ugly particle pollution numbers for the Pittsburgh area, especially at noon on Monday after a rainy weekend. This pollution, which is mostly from vehicle exhaust, lingers in the valleys that many of these busy roads run through.

As Turnpike tolls continue to go up, more and more vehicles utilize non-toll roads like US 22, US 30, US 376 (Parkway east and west), US 65 and other non-toll roads that aren't equipped for this level of traffic.