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This study tests our current understanding of wildfire emissions, chemistry, and health effects as implemented in the GEOS-Chem chemical transport model. Three-or-more-day-old smoke transported from California and the Pacific Northwest increased CO, PM2.5, and total measured VOCs by factors of 2\342\200\2238, with hourly maxima of 800 ppb, 120 \302\265g m-3, and 85 ppb, respectively. In contrast, NOx levels were not elevated compared to the urban background. O3 showed a non-monotonic response to wildfire smoke: MDA8 O3 increased under light smoke but flattened or declined when PM2.5 exceeded ~30\342\200\22340 \302\265g m-3, a feature that GEOS-Chem failed to reproduce. A 2020-style wildfire season recurring annually would yield an excess lifetime cancer risk of 100-in-1 million or approximately 7 times the non-smoke baseline. The noncancer hazard index (HI) would reach 3.0, meaning substantially elevated acute risks during high-smoke periods. About 90 % of cancer risks are from PM2.5, whereas non-cancer risks are dominated by formaldehyde, benzene, acrolein, and acetaldehyde. GEOS-Chem captured major smoke intrusions but underestimated CO, PM2.5, and VOCs by 30\342\200\22390 %. These model biases propagate to health metrics, with GEOS-Chem underestimating smoke-attributable cancer risk by ~40 % and chronic HI by ~10 times. We attribute the model errors to underpredicted fire emissions and unrepresented VOC chemistry, which together led to an overestimation of OH and insufficient secondary production." } } } rows { name { value: "label" } } rows { quad { p_iri { } o_literal { lex: "Characterizing emissions, chemistry, and health impacts of aged wildfire smoke in a western US city" } } } rows { prefix { value: "https://schema.org/" } } rows { name { value: "funder" } } rows { name { value: "021nxhr62" } } rows { quad { p_iri { prefix_id: 6 } o_iri { prefix_id: 14 } } } rows { name { value: "hasMetadata" } } rows { quad { p_iri { prefix_id: 5 } o_iri { prefix_id: 1 name_id: 1 } } } rows { prefix { value: "https://www.w3.org/ns/dcat#" } } rows { name { value: "contactPoint" } } rows { quad { p_iri { prefix_id: 7 name_id: 29 } o_literal { lex: "lixu.jin@umontana.edu" } } } rows { name { value: "endDate" } } rows { quad { p_iri { } o_literal { lex: "January 21 2026" } } } rows { name { value: "startDate" } } rows { quad { p_iri { } o_literal { lex: "2025" } } } rows { name { value: "wasAttributedTo" } } rows { name { value: "0009-0008-8411-2742" } } rows { quad { s_iri { prefix_id: 2 name_id: 4 } p_iri { prefix_id: 10 name_id: 32 } o_iri { prefix_id: 9 } g_iri { prefix_id: 2 name_id: 7 } } } rows { name { value: "name" } } rows { quad { s_iri { prefix_id: 9 name_id: 33 } p_iri { prefix_id: 11 } o_literal { lex: "Emily Regalado" } g_iri { prefix_id: 2 name_id: 9 } } } rows { name { value: "created" } } rows { datatype { value: "http://www.w3.org/2001/XMLSchema#dateTime" } } rows { quad { s_iri { prefix_id: 1 name_id: 1 } p_iri { prefix_id: 4 name_id: 35 } o_literal { lex: "2026-05-01T17:51:21.441Z" datatype: 1 } } } rows { quad { p_iri { name_id: 13 } o_iri { prefix_id: 9 name_id: 33 } } } rows { name { value: "license" } } rows { prefix { id: 3 value: "https://creativecommons.org/licenses/by/4.0/" } } rows { quad { p_iri { prefix_id: 4 name_id: 36 } o_iri { prefix_id: 3 name_id: 2 } } } rows { prefix { id: 13 value: "http://purl.org/nanopub/x/" } } rows { name { value: "introduces" } } rows { prefix { id: 15 value: "https://doi.org/10.5194/" } } rows { quad { p_iri { prefix_id: 13 name_id: 37 } o_iri { prefix_id: 15 name_id: 12 } } } rows { name { value: "wasCreatedAt" } } rows { prefix { id: 12 value: "https://nanodash.knowledgepixels.com/" } } rows { quad { p_iri { prefix_id: 13 name_id: 38 } o_iri { prefix_id: 12 name_id: 2 } } } rows { prefix { id: 16 value: "https://w3id.org/np/o/ntemplate/" } } rows { name { value: "wasCreatedFromProvenanceTemplate" } } rows { name { value: "RA7lSq6MuK_TIC6JMSHvLtee3lpLoZDOqLJCLXevnrPoU" } } rows { quad { p_iri { prefix_id: 16 name_id: 39 } o_iri { prefix_id: 1 } } } rows { name { value: "wasCreatedFromPubinfoTemplate" } } rows { name { value: "RACJ58Gvyn91LqCKIO9zu1eijDQIeEff28iyDrJgjSJF8" } } rows { quad { p_iri { prefix_id: 16 } o_iri { prefix_id: 1 } } } rows { name { value: "RAukAcWHRDlkqxk7H2XNSegc1WnHI569INvNr-xdptDGI" } } rows { quad { o_iri { } } } rows { name { value: "wasCreatedFromTemplate" } } rows { name { value: "RArM5GTwgxg9qslGX-XiQ-KTTUwdoM0KB1YqmT4GqTizA" } } rows { quad { p_iri { prefix_id: 16 } o_iri { prefix_id: 1 } } } rows { name { value: "sig" } } rows { name { value: "hasAlgorithm" } } rows { quad { s_iri { prefix_id: 2 } p_iri { prefix_id: 13 } o_literal { lex: "RSA" } } } rows { name { value: "hasPublicKey" } } rows { quad { p_iri { } o_literal { lex: "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxzr6UBGMW6c8tegz0babaledWUEQ0PLDE4tp7Iinbe2DZtAtY5JUptKYuStWDZx+QER4808P8dejNWRnBDzgthYJm/AyNSXflHSJhz2+NC+h7RylOLxbwLEQocmyKKiYxa2gT85m6ajVL2M6TnfG67nnK+K2f7iCGL6wYXRITD1q+7+5SWqBdDXIV921W4IKWaD2GJk+NRBoOqQhbsrk8Tn5XsNd7DMYVHk47oMDGbeBnrOIoRPsbBgAcoCsxxhiB9yN6Lf8EUbnlXVEDzJuZk048L1BDZL+6nkA8btTQGP2ijUFWA7rTrod3LjUDQWLZS95njjl867dtmv/znYkzwIDAQAB" } } } rows { name { value: "hasSignature" } } rows { quad { p_iri { } o_literal { lex: "IMFhKVm+GQkpWrA7cnpcSc0sOaE/oZ7bGiSLlhpgiWkaVGUseL0EBSep2r74/WzTSFjOISJC0REuavoyJl4GSDOt7KxySL7y0iO3i4QJsaS+xxnEjV3CgmdupkiyIASoWOcTkEe0wGftLm6IqZgCbH/GPwlfdUBuI5GMC+cIs3R9/adH6PO+Nk6GZosyBktvqWwId03WcpzDQhmJifcYKfoeadVYLmbwvyiMnIvABt7BnTqYJa9XEGPONA/cgz4CNsHWZsPPg3caBTo8aOQVk27JSkzBBMkPlbe5TxnpLAWHsgirBXu0RSVFMCFbzj24YqayhDm2ICYo/oQ3NrRyHw==" } } } rows { name { value: "hasSignatureTarget" } } rows { quad { p_iri { } o_iri { prefix_id: 1 name_id: 1 } } } rows { name { value: "signedBy" } } rows { quad { p_iri { prefix_id: 13 name_id: 51 } o_iri { prefix_id: 9 name_id: 33 } } }