A point or two to ponder:

When vehicles tyres wear, they liberate large quantities of rubber dust and although these days only about 40% of the rubber content of a car tyre is natural latex, that is still a massive quantity of rubber dust which, for those people unfortunate enough to be allergic to Hevea latex, could be expected to bring on a life threatening allergic reaction, particularly in towns where traffic is dense and the continuous heavy traffic will stir up the rubber dust especially in prolonged dry spells.

When I was young and right up to the 1990s, vehicle brake pads and brake shoes contained large quantities of asbestos which produced a fine dust as the friction materials wore away. This dust was deposited on the roads particularly after disc brakes became common (the dust produced by drum brakes tends to stay in the drums).

My questions are therefore:
why are people allergic to natural latex not dying like flies in the street from exposure to rubber dust from vehicle tyres and why were the majority of people who lived in towns prior to the 1990s not affected by asbestosis and mesothelioma from exposure to vehicle brake dust?