Aliso Canyon Content / Aliso Canyon Content for ºÙºÙÊÓƵ en Study: California Blowout Led to Largest U.S. Methane Release Ever /news/study-california-blowout-led-largest-us-methane-release-ever <p>First published study since the Aliso Canyon well was sealed shows leak was equivalent to one-quarter of Los Angeles' annual methane pollution, the largest methane leak in U.S. history.&nbsp;</p> February 25, 2016 - 3:52pm Katherine E Kerlin /news/study-california-blowout-led-largest-us-methane-release-ever