NorCal height of summer when everything is really dry. You don't just step off a trail to water the bushes. We have poison oak. During the spring it flourishes and sap runs, because that's our green wet time. As things dry out, it's sap turns into a dust that settles out onto the trails and everything around it. Take a trail side leak causing the dust to poofh up. Well, it's hot, your bare legs are sweaty, and the dried sap is in the dust. Many young ladies have gotton the rash in a bad place from stepping behind a bush off the trail. It grows just about everywhere out in the bush. Brush fires can be very dangerous. Supposedly the fire and forestry services have something their people take every spring.
It takes tree hugging and whizz breaks to a whole new meaning if it's the wrong tree in the wrong bushes around here in NorCal.
You can dry out the rash with warm oatmeal. It feels like your sores are being scratched they way you can't with your fingers because you would spread it and make the sores worse. Warm oatmeal sucks out the urushiol the same way it empties your pores of excess oil and dirt. I had a rash on 25% of my body once and had to lay in a bathtub of oatmeal. You just can't trust free firewood here in NorCal.