It wouldn't be the last. People had been donning gas masks in the smoky air for joke photos for a decade, but this was the first official recognition of Los Angeles' signature air pollution. Learn more about your ad choices. Visit <a href="https://megaphone.fm/adchoices">megaphone.fm/adchoices</a>

It wouldn't be the last. People had been donning gas masks in the smoky air for joke photos for a decade, but this was the first official recognition of Los Angeles' signature air pollution. Learn more about your ad choices. Visit megaphone.fm/adchoices

It wouldn't be the last. People had been donning gas masks in the smoky air for joke photos for a decade, but this was the first official recognition of Los Angeles' signature air pollution. Learn more about your ad choices. Visit <a href="https://megaphone.fm/adchoices" rel="noopener noreferrer">megaphone.fm/adchoices</a>

1955: L.A.'s First Smog Alert

On hiatus as of March 2020 because of the coronavirus crisis. Get unlimited access to the Chronicle. | A daily celebration of the news — and the news media — of years gone by. King Kaufman takes you on a quick tour of the Bay Area and the world as it used to be, which often colors the world of your century.

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1955: L.A.'s First Smog Alert

1955: L.A.'s First Smog Alert

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