M6 flys over
Concrete pillars hold it up
Pollutants rain down
n.b. Looking at this map one realises that the prevailing south-westerly wind blows vast amounts of diesel smuts, nitrogen dioxide and other exhaust filth across the metropolitan borough of Walsall.
This section of Britain’s motorway network is rarely free-flowing, so fumes are an issue. Of course, no one would ever build a school nearby.