177 - Ann Carlson, Smog and Sunshine: The Surprising Story of How Los Angeles Cleaned Up Its Air

In this episode of the History of California Podcast, host Jordan Mattox sits down with Ann Carlson to explore the history and legacy of air pollution regulation in California, as told in her book Smog and Sunshine. The conversation traces the transformation of Los Angeles from one of the most polluted regions in the United States to a global leader in environmental policy. Carlson explains how early misdiagnoses—like the infamous Tucker Report—delayed action, and how scientists, activists, journalists, and government institutions eventually converged to identify automobiles as the primary source of smog . Mattox and Carlson dig into the mechanics of environmental law, including the shift from bipartisan consensus to regulatory fragmentation, the increasing reliance on federal agencies, and the critical role of states—especially California—in advancing climate policy when the federal government stalls . The episode also highlights the catalytic converter as a case study in how ambitious regulation can drive technological innovation. The discussion goes beyond policy to examine environmental justice, showing how pollution has historically—and continues to—disproportionately affect low-income communities and communities of color, particularly in regions like the Inland Empire . Throughout the episode, Carlson makes a broader argument: that environmental progress is not accidental, but the result of sustained pressure from the public, media, scientists, and institutions working together over decades. The episode closes by connecting these historical lessons to the present, asking what California’s experience can teach us about confronting climate change in an era of political polarization and misinformation. This is a conversation about history as both memory and blueprint—reminding us not just how far we’ve come, but what it might take to move forward.