Presuming the stats are correct, it's interesting how localised this can be - unhealthy levels very close to healthly levels. I read a pollution report on my ci

Presuming the stats are correct, it's interesting how localised this can be - unhealthy levels very close to healthly levels. I read a pollution report on my city recently where they talked about pollution "canyons", busy roads surrounded on both sides by tall buildings, which kept the pollution focused on that road.