{"id":26832,"date":"2026-03-12T06:30:00","date_gmt":"2026-03-12T13:30:00","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/?p=26832"},"modified":"2026-03-23T18:38:03","modified_gmt":"2026-03-24T01:38:03","slug":"eaton-fire-sent-a-pollution-wave-across-los-angeles","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/eaton-fire-sent-a-pollution-wave-across-los-angeles\/","title":{"rendered":"Eaton fire sent a pollution wave across Los Angeles"},"content":{"rendered":"\n\n\n    \n                                          \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n          \n<div class=\"f--field f--image\">\n\n    \n    \n    \n    \n    \n    \n              \n      <img\n                            data-src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-top-768x432.jpg\"\n          data-srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-top-1920x1080.jpg 1920w,https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-top-1280x720.jpg 1280w,https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-top-768x432.jpg 768w\"          data-sizes=\"(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw\"          class=\"lazyload\"\n        \n                  alt=\"Smoke rises over mountainous ridges as flames burn brush\"\n        \n        \n                                      \/>\n\n    \n    \n  \n  \n\n<\/div>\n  \n      <div class=\"image-caption\">\n          \n<div class=\"f--field f--description\">\n\n    \n  Smoke billows above the Eaton Fire in Southern California\u2019s San Gabriel Mountains just north of Pasadena, Calif., on Jan. 28, 2025. (Image source: Wikimedia Commons.)\n\n\n<\/div>\n    <\/div>\n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a href=\"\/news\/stories\/\/?category=health\">Health<\/a><\/li>\n                  <\/ul>\n      <\/nav>\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>Eaton fire sent a pollution wave across Los Angeles<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  A USC Dornsife-led study found that the Eaton fire\u2019s daily carbon monoxide emissions far exceeded L.A. County\u2019s average daily emissions from all human activity.\n\n\n<\/div>\n      <\/div>\n    \n           <strong class=\"author-field\"><span >By<\/span><a href=\"mailto:communication@dornsife.usc.edu\">Jim Key<\/a><\/strong>\n    \n          <span class=\"post-date-field\">March 12, 2026<\/span>\n      <\/div>\n<\/div>\n\n\n  <\/div><\/div>\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--social-share \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--social-share\"\n    \n      >\n\n    \n  <div class=\"content-wrapper\">\n    <span class=\"a2a_kit a2a_kit_size_32 addtoany_list\" style=\"line-height: 32px;\">\n      <span class=\"title\">\n        Share\n      <\/span>\n                        <a class=\"a2a_button_copy_link\" target=\"_blank\" href=\"\/#copy_link\" rel=\"nofollow noopener\" title=\"Link\">\n            <span class=\"a2a_svg a2a_s__default a2a_s_copy_link\">\n              <svg height=\"19\" viewBox=\"0 0 19 19\" width=\"19\" 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cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>The 2025 Eaton fire\u2019s smoke did more than darken the sky: It generated a carbon monoxide and particulate matter surge that far exceeded Los Angeles County\u2019s average daily human-caused emissions, according to a <a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acsestair.5c00430\" target=\"_blank\" rel=\"noopener\">new study<\/a> led by researchers at the USC Dornsife College of Letters, Arts and Sciences.<\/p>\n<p><strong>Why it matters: <\/strong>The findings show how a major urban wildfire can quickly become a regional air-quality crisis, sending harmful smoke across L.A. and raising concerns about respiratory, psychological and other health effects that Keck School of Medicine of USC researchers are <a href=\"https:\/\/keck.usc.edu\/news\/usc-researchers-to-assess-immediate-and-long-term-health-impacts-of-la-wildfires-through-project-firestorm\/\" target=\"_blank\" rel=\"noopener\">now studying<\/a>.<\/p>\n<p><strong>What they found: <\/strong>Researchers estimated the Eaton fire produced carbon monoxide at rates more than 20 times higher than L.A. County\u2019s average daily human-caused emissions.<\/p>\n<ul>\n<li>\u201cPeople could see the smoke, but they couldn\u2019t see the scale of the pollution it was carrying,\u201d said <a href=\"https:\/\/dornsife.usc.edu\/profile\/william-berelson\/\">William Berelson<\/a>, professor of <a href=\"https:\/\/dornsife.usc.edu\/earth\/\">Earth sciences<\/a>, <a href=\"https:\/\/dornsife.usc.edu\/environmental-studies\/\">environmental studies<\/a> and <a href=\"https:\/\/dornsife.usc.edu\/spatial\/\">spatial sciences<\/a> at USC Dornsife and a co-author of the study. \u201cThis one fire was producing carbon monoxide on a scale that exceeded the entire county\u2019s usual daily emissions from human activity.\u201d<\/li>\n<\/ul>\n<p><strong>Zoom in: <\/strong>Burning homes and other structures accounted for a larger share of the fire\u2019s carbon emissions than trees and shrubs did, helping explain why the Eaton fire created such a large regional impact.<\/p>\n<figure id=\"attachment_26837\" aria-describedby=\"caption-attachment-26837\" style=\"width: 500px\" class=\"wp-caption alignright\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-26837\" src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-co-figure-500x305.jpg\" alt=\"Graph of color squares representing carbon monoxide concentration in air from east to west in L.A. on Jan. 7 and 8, 2025\" width=\"500\" height=\"305\" srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-co-figure-500x305.jpg 500w, https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-co-figure-768x469.jpg 768w, https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-co-figure.jpg 980w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><figcaption id=\"caption-attachment-26837\" class=\"wp-caption-text\">Data analysis of Eaton fire smoke shows how carbon monoxide levels increase across Los Angeles from east to west over the first two days. (Image source: ACS ES&amp;T Air.)<\/figcaption><\/figure>\n<p><strong>How they did it: <\/strong>Researchers combined satellite imagery, computer-aided modeling of the smoke plumes and on-the-ground air measurements to estimate what burned and track how smoke moved across the region in near real time.<\/p>\n<ul>\n<li>The air data included readings from the Carbon Census <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/sensors-map-greenhouse-gases\/\">network of sensors<\/a> deployed around Los Angeles by Berelson\u2019s team.<\/li>\n<\/ul>\n<p><strong>By the numbers: <\/strong>The team estimated the Eaton fire released about 153 million kilograms of carbon (337 million pounds).<\/p>\n<ul>\n<li>Smoke reached downtown L.A. within hours of the fire\u2019s start, then moved west, reaching coastal areas several hours later.<\/li>\n<li>At some monitoring sites, levels of harmful fine-particle pollution known as PM2.5 exceeded the EPA\u2019s 24-hour health standard for one to three days.<\/li>\n<\/ul>\n<p><strong>The big picture: <\/strong>The January 2025 Los Angeles fires affected the region in different ways, but the Eaton fire stands out because its smoke moved directly into central and western Los Angeles, exposing communities far from the burn area.<\/p>\n<ul>\n<li>By contrast, early emissions from the Palisades fire were carried offshore by winds.<\/li>\n<\/ul>\n<p><strong>What it means: <\/strong>The study suggests urban wildfires should be understood not only as disasters of flame and loss, but also as citywide air-quality emergencies with climate and public-health consequences.<\/p>\n<ul>\n<li>The findings could help scientists and policymakers better estimate the full costs of urban fires, including emissions and air-quality impacts that spread across an entire metro area.<\/li>\n<\/ul>\n<figure id=\"attachment_26843\" aria-describedby=\"caption-attachment-26843\" style=\"width: 1508px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-26843 size-full\" src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-map-2.jpg\" alt=\"Map of Los Angeles with a compas, black and maroon circles marking sensor locations and flame icons where fires started\" width=\"1508\" height=\"970\" srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-map-2.jpg 1508w, https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-map-2-500x322.jpg 500w, https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-map-2-1024x659.jpg 1024w, https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2026\/03\/berelson-eaton-fire-map-2-768x494.jpg 768w\" sizes=\"(max-width: 1508px) 100vw, 1508px\" \/><figcaption id=\"caption-attachment-26843\" class=\"wp-caption-text\">A map of L.A. shows Carbon Census (black) and Los Angeles Megacity Carbon Project (maroon) node locations as well as where the Palisades (left) and Eaton (right) fires broke out. (Image source: ACS ES&amp;T Air.)<\/figcaption><\/figure>\n<p><strong>About the study<\/strong><\/p>\n<p>In addition to Berelson, study authors include Pietro Vannucci and Wenye Wang of USC Dornsife and Jooil Kim and Timothy Lueker of Scripps Institution of Oceanography, University of California, San Diego.<\/p>\n<p>The research was supported by USC through a President\u2019s Sustainability Award and a USC Dornsife Public Exchange Grant.<\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n\n\n\n  \n        \n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-related-stories \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-related-stories\"\n    \n      >\n\n    \n  <div class=\"inner-wrapper\">\n              \n<div class=\"f--field f--section-title\">\n\n    \n  <h2>\n          Related Articles\n      <\/h2>\n\n\n<\/div>\n    \n                  <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/dexter-holland-the-offspring-usc-dornsife-commencement-speaker-2026\/\" \n                        class=\"\" \n      >Dexter Holland, frontman for rock band The Offspring, to deliver USC Dornsife commencement address<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n              <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/matthew-pratt-aaas-fellow\/\" \n                        class=\"\" \n      >USC Dornsife chemistry professor named fellow of leading global scientific organization<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n              <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/ai-may-promote-cultural-homogenization\/\" \n                        class=\"\" \n      >AI is changing more than your writing \u2014 it may be shaping your worldview<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n            <\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>A USC Dornsife-led study found that the Eaton fire\u2019s daily carbon monoxide emissions far exceeded L.A. County\u2019s average daily emissions from all human activity.<\/p>\n","protected":false},"author":14,"featured_media":26834,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[26,16],"tags":[159,65,1968,69,60,362],"class_list":["post-26832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-health","category-science-and-technology","tag-earth-sciences","tag-environment","tag-physical-sciences","tag-pollution","tag-research","tag-wildfire"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Eaton fire sent a pollution wave across Los Angeles<\/title>\n<meta name=\"description\" content=\"USC Dornsife study finds the fire\u2019s daily carbon monoxide emissions far exceeded the county\u2019s average daily emissions from all human activity\" 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