Environmental pollution and management (Amsterdam, Netherlands)最新文献

{"title":"Characterizing the near-road NO_x gradient for exposure assessment purposes.","authors":"Jessica L Levasseur, Qingyu Meng, Kristen M Rappazzo, Peter Byrley","doi":"10.1016/j.epm.2026.01.002","DOIUrl":"10.1016/j.epm.2026.01.002","url":null,"abstract":"<p><strong>Background: </strong>Nationwide, in 2020, 24 % of the U.S. population lived near high volume roadways, a source of nitrogen oxides (NO_x) and nitrogen dioxide (NO₂) emissions. This study synthesizes literature regarding NO_x and NO₂ gradients in the near-road environment to understand community exposures. We synthesize literature reporting measured NO_x and NO₂ concentrations at increasingly large distances from a single roadway and variables impacting those concentrations.</p><p><strong>Methods: </strong>Using the systematic literature search devised by U.S. EPA to develop Integrated Science Assessments, we identified publications that focused on near-road gradients of NO₂ and NO_x. The literature around near-road decay gradients were synthesized and summarized. Concentrations, distance to roadway, and other relevant information were extracted and analyzed using visual and regression methods to better understand the near-road decay gradient.</p><p><strong>Results: </strong>Concentrations of NO_x and NO₂ decrease with increasing distance from major roadways, following nonlinear decay patterns. Analyzing these data revealed a decreasing power decay trendline. NO_x and NO₂ concentrations typically reduced approximately to background levels by 500 m, with the steepest decline occurring within 50 m from roadways. Concentrations increased with cooler temperatures and higher traffic.</p><p><strong>Conclusion: </strong>Gradients characterized by this review described how near-road populations are exposed to NO_x and the variables that may better describe community exposure. This review provides a quantitative research synthesis of variables most impactful on near-road gradient exposures to NO_x. Various meteorological and traffic variables were found to impact near-road gradients, though the gradient was driven by distance from the road.</p>","PeriodicalId":521398,"journal":{"name":"Environmental pollution and management (Amsterdam, Netherlands)","volume":"3 ","pages":"128-137"},"PeriodicalIF":0.0,"publicationDate":"2026-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13137458/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147849387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}