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It details the center’s mission from research, application, and outreach to community education, emphasizing centralized distribution and user support. Core functions include outreach, research, software development, and applications support, supported by an External Advisory Committee and broad software distribution via major modeling tools.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/cmas-center-overview-of-cmas-center-operations-and-cmaq-modeling-system-distribution-support/497665/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/cmas-center-overview-of-cmas-center-operations-and-cmaq-modeling-system-distribution-support/497665.png","ImageObject",300,407,{"name":92,"@type":93},"8796093062539","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29","2026-10-02",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the CMAS Center and why was it established?","Question",{"text":112,"@type":113},"The CMAS Center was established by the U.S. Environmental Protection Agency in 2001 to transfer primary responsibility for development, maintenance, and applications support of the Models-3 air quality modeling system to an organization serving the air quality modeling community.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What are the main objectives and primary functions of the CMAS Center?",{"text":117,"@type":113},"Its objectives include bridging community segments, fostering growth of developer and user communities, and serving as a hub for model education and training. The four primary functions are Outreach, Research, Software Development, and Applications and User Support.",{"name":119,"@type":110,"acceptedAnswer":120},"How does the CMAS Center support software and source code distribution?",{"text":121,"@type":113},"The center distributes and supports CMAQ at the core and also supports numerous related software products. Source code distribution moved from CVS to a GitHub repository, with testing and benchmarking of updates prior to public release.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},497665,1792161534,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":66,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":133,"file_id":134,"file_url":135,"file_type":136,"file_size":137,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":19,"language":138,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":139,"faqs":140,"seo_title":141,"seo_description":67,"update_tm":142,"read_time":52,"preview_page_count":4},8796093062539,"The Community Modeling and Analysis System Center by Saravanan Arunachalam  \nThe Community Modeling and Analysis System Center  \n22 Years of Serving a Global User Community  \nby Saravanan Arunachalam  \nAn overview of the operations at the CMAS Center, including the distribution and support of the CMAQ modeling system.  \nThe Community Modeling and Analysis System Center by Saravanan Arunachalam  \nThe Community Modeling and Analysis System (CMAS) Center was established by the U.S. Environmental Protection Agency (EPA) in 2001 as a mechanism for transferring primary responsibility for the development, maintenance, and applications support of the Models-3 air quality modeling system from EPA to a separate organization serving the needs of the air quality modeling community. The center was designed to leverage the community’s intellectual capital to continue refning air quality modeling tools to improve and support their applications for critical problem analysis and decision-making.  \nFrom research to application to outreach, the goal of the CMAS Center is to advance the community modeling paradigm through the establishment of a centralized resource to serve the environmental modeling community. The main objectives of the center were to serve as a bridge between segments of the air quality modeling community, foster growth of developer and user communities, and serve as a hub for model education and training. At the core of CMAS operations is the distribution and support of the Community Multiscale Air Quality (CMAQ) modeling system and the Sparse Matrix Operator Kernel Emissions (SMOKE) model. The modeling support expanded, over the years, to include additional modeling tools that are discussed below.  \nThe CMAS Center was initially hosted by MCNC Environmental Programs in Research Triangle Park, NC. In January 2003, the CMAS Center transitioned to the University of North Carolina (UNC) at Chapel Hill, where it remains operational today. The host organization for the CMAS Center is awarded by a periodic competitive proposal process, and the current term for the CMAS Center runs through July 2026.1  \nPrior to the 1990s, advancements in air quality model technology could not be easily shared between modelers because of technical incompatibilities in algorithms, software, operating systems, and so forth. By standardizing with open-source, advanced modeling systems, the CMAS Center enables collaborative development and linking of models for meteorology, emissions, air quality, hydrology, and environmental and health effects. Initial design focused on using a“modular” approach, where developers separated individual atmospheric processes into independent pieces, which then act like building blocks that execute one aspect of functionality. The CMAS Center-supported models, such as CMAQ and SMOKE, use the concept of “modularity” to empower developers to upgrade existing atmospheric processes or add new ones, thus ensuring rapid evolution of software torefect advances in scientifc knowledge and to meet changing needs of the environmental modeling community.  \nTo address the challenges of the 1990 U.S. Clean Air Act Amendments and to study the complex relationship between multiple pollutants, EPA developed the CMAQ modeling system,2,3 a third-generation, multi-scale, multi-pollutant modeling system. With a community model approach, a  \nneed was identifed to promote community air quality modeling and its connections with human/ecological health and climate/air quality assessments. Working toward this goal, the CMAS Center is designed to leverage the modeling community’s intellectual capital in air quality modeling and analyses and to continually refne the tools available for addressing air quality issues through collaboration.  \nThe CMAS Center has four primary functions to lead and coordinate the activities: Outreach, Research, Software Development, and Applications and User Support. In addition, the CMAS Center has an External Advisory Co","cbCaiexsE0iGf5AF","https://ap.wps.com/l/cbCaiexsE0iGf5AF","pdf",3741049,"English","# CMAS Center purpose and objectives\n## Founding, transition, and hosting\n## Core models and modular approach\n## Support functions and external advisory committee\n## Software support and download activities\n## Source code distribution and development workflow","[{\"question\":\"What is the CMAS Center and why was it established?\",\"answer\":\"The CMAS Center was established by the U.S. Environmental Protection Agency in 2001 to transfer primary responsibility for development, maintenance, and applications support of the Models-3 air quality modeling system to an organization serving the air quality modeling community.\"},{\"question\":\"What are the main objectives and primary functions of the CMAS Center?\",\"answer\":\"Its objectives include bridging community segments, fostering growth of developer and user communities, and serving as a hub for model education and training. The four primary functions are Outreach, Research, Software Development, and Applications and User Support.\"},{\"question\":\"How does the CMAS Center support software and source code distribution?\",\"answer\":\"The center distributes and supports CMAQ at the core and also supports numerous related software products. Source code distribution moved from CVS to a GitHub repository, with testing and benchmarking of updates prior to public release.\"}]","CMAS Center - Overview of CMAS Center Operations and CMAQ Modeling System Distribution Support | PDF",1790963381]