My run takes me very close to the M1 at several points and this morning I particularly noticed how the level of traffic pollution grew almost exponentially the closer I got

At some points you could cut the atmosphere with a knife...
Maybe it was a function of the cool, still air?
Or perhaps it's my severe allergy to VOCs, exhaust fumes, petroleum products and mineral oils?
I feel really sorry for those who live close to the M1 and can't help feeling moves to reduce vehicle use and the ramping up of electric traction just cannot come soon enough...
This morning i was particularly shocked by it...