Temp 72, DP 65 at the start, temp 78, DP 68 at finish. Pollen of 8.3. Breathing no issue, though :)
Ran out to Bethesda and back with Anna, Nora, Stephen, Edie (and George for first part - hung with Edie through 10 while others ran ahead, then added on. Definitely noted heat at the end.