Yeah, the idea of mounting them on top of vehicle seemed a bit strange to me too, given how the particulate sensors work. Perhaps they could use the GPS and jus

Yeah, the idea of mounting them on top of vehicle seemed a bit strange to me too, given how the particulate sensors work. Perhaps they could use the GPS and just sample for a bit when the vehicle has been stopped for a few seconds? I didn't think of the temperature issue - that does seem like a tricky problem too...