How Los Angeles fought its way out of deadly smog
Southern California once faced some of the worst air pollution in US history. During the 1940s, 50s, and 60s, thick smog blanketed the region so severely that many called it uninhabitable. Residents like Ann Carlson grew up with stinging eyes and burning lungs, while visibility often dropped below three miles for months at a time. The crisis began decades ago, with fine particulate matter frequently obscuring the skies. By the 1960s, visibility fell under three miles for nearly half the year. In 1970 alone, the Los Angeles Basin recorded nine stage 3 smog alerts, signalling extreme danger.
Dr. Arie Haagen-Smit’s early research into smog formation faced fierce opposition. Oil companies dismissed his findings, while car manufacturers refused to act. Yet, by the 1950s, a local supervisor began pressuring automakers to reduce emissions. The human cost was staggering. Children in 1970s Los Angeles carried lead levels in their blood over 1,000% higher than those in Flint, Michigan, during its water crisis. Juana Gutierrez, co-founder of Mothers of East Los Angeles, later reshaped how communities understood pollution’s toll. Even Ann Carlson’s stepfather, years later, simply blamed the smog on 'the environment.' Change came with technology. The widespread adoption of catalytic converters in vehicles became the key driver of cleaner air, drastically cutting harmful emissions over time.
Today, Los Angeles breathes easier thanks to stricter regulations and cleaner car technology. The catalytic converter remains the single most important factor in reducing smog. Yet the legacy of those smog-filled decades still lingers in the memories of those who lived through them.
