Above: four photos of Los Angeles made in 1948 showing the poor quality of air in the city at that time. Bad air is only occasionally mentioned in period fiction, and of course old movies created a clean air illusion by striving to shoot at a distance only on clear days, but low visibility due to smog was a common occurrence. And L.A. wasn’t the only metro area with such problems—it was general around the U.S.
The same year these photos were made, smog covered a swath of rural Pennsylvania south of Pittsburgh for five days, killing twenty people and sickening thousands. Smog was also a problem globally. In London in 1952 during an extended bad air event, an estimated 12,000 people died. It probably comes as no surprise to know that pollution tends to concentrate around industrial areas and transit hubs, which are nearly always where low income residents live.
In the U.S., when the 1970 Clean Air Act passed over opposition from conservative and business interests, air quality improved, but pollution still kills seven to eight million people a year globally. U.S. mortality numbers rose significantly between 2016 and 2020 because the Clean Air Act was weakened then, with thirty-plus portions of the legislation abolished. Even so, more deregulation is coming.