/https%3A//blueprint-api-production.s3.amazonaws.com/uploads/card/image/763784/68d8a0e4-6a43-4816-8c92-e7f505fe0a4c.jpg)
In the 1950s, Los Angeles residents raised signs protesting the region's filthy air. One woman's sign, at an anti-smog committee meeting in 1954, mocked that Los Angeles' San Gabriel Valley had been transformed into the inhospitable "Death Valley."
Largely due to car pollution,...
