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Interpretation focuses on AllData (A) or the last complete year, using benchmark tests and referenced assessment methods to compare FEM consistency across agencies.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & Report",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/pm25-continuous-monitor-comparability-assessment-tool-technical-note/203303/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/pm25-continuous-monitor-comparability-assessment-tool-technical-note/203303.png","ImageObject",300,407,{"name":42,"@type":43},"Angel","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-01","2026-09-04",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",24,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What does the PM2.5 continuous monitor comparability assessment evaluate?","Question",{"text":63,"@type":64},"It assesses the comparability of a PM2.5 continuous monitor when collocated with an FRM sampler, supporting evaluation for intended monitoring objectives such as NAAQS comparison and/or AQI reporting.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How are results organized for interpretation?",{"text":68,"@type":64},"Data are summarized across fixed seasons for multiple years, by year, and for all data. Interpretation is recommended using either the entire dataset (AllData/A) or the last complete year.",{"name":70,"@type":61,"acceptedAnswer":71},"Which benchmark tests and outputs are used in the assessment?",{"text":72,"@type":64},"The tool presents assessments in the context of benchmark tests, including linear regression comparisons, difference trend visuals, and Part 53-based criteria for slope/intercept and correlation relative to CCV, along with bias calculations using referenced equations.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},203303,1788559568,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,111,115,120,123,127],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":103,"show_sort_weight":104,"slug":105},6,"Technology",50,"technology",{"id":107,"doc_module":4,"doc_module_name":25,"category_name":108,"show_sort_weight":109,"slug":110},7,"Healthcare",40,"healthcare",{"id":112,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":113,"slug":114},8,30,"research-report",{"id":116,"doc_module":4,"doc_module_name":25,"category_name":117,"show_sort_weight":118,"slug":119},9,"Religion & Spirituality",20,"religion-spirituality",{"id":118,"doc_module":4,"doc_module_name":25,"category_name":121,"show_sort_weight":118,"slug":122},"World Cup","world-cup",{"id":124,"doc_module":4,"doc_module_name":25,"category_name":125,"show_sort_weight":124,"slug":126},10,"Lifestyle","lifestyle",{"id":128,"doc_module":4,"doc_module_name":25,"category_name":129,"show_sort_weight":97,"slug":130},19,"General","general",{"code":4,"msg":82,"data":132},{"doc_id":79,"user_id":133,"nickname":42,"user_avatar":134,"doc_module":4,"category_id":112,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":33,"language":140,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":12,"update_tm":80,"read_time":124,"preview_page_count":4},687207412472,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","UNITED STATES ENVIRONMENTAL PROTECTION AGENCY RESEARCH TRIANGLE PARK, NC 27711  \nOFFICE OF AIR QUALITY PLANNING AND STANDARDS  \nTechnical Note-PM2.5 Continuous Monitor Comparability Assessment1  \nThe PM2.5 continuous monitor comparability assessment tool is available at:  \n[https://www.epa.gov/outdoor-air-quality-data/pm25-continuous-monitor-comparability-assessments](https://www.epa.gov/outdoor-air-quality-data/pm25-continuous-monitor-comparability-assessments)  \nSummary:  \nThis tool provides a one-page technical report that assesses the comparability of a PM2.5 continuous monitor when collocated with an FRM sampler. These reports are intended to assist monitoring agencies in understanding if the PM2.5 continuous monitors operated in their network are appropriate for their intended monitoring objective (i.e., comparison to the NAAQS and/or reporting the AQI). Data are summarized by season across years, by year, and for all data. The most appropriate way to interpret the comparability of the PM2.5 continuous monitors is to look at either the entire data set, designated as “AllData” or “A”, or view the last complete year of data. The comparability assessments are presented in the context of several benchmark tests to assist with that evaluation. The assessment methods are described in detail in the following memo-Assessment of PM2.5 FEMs Compared to Collocated FRMs available at: [https://www3.epa.gov/ttn/naaqs/standards/pm/data/HanleyandReff040711.pd](https://www3.epa.gov/ttn/naaqs/standards/pm/data/HanleyandReff040711.pdf. The)[f](https://www3.epa.gov/ttn/naaqs/standards/pm/data/HanleyandReff040711.pdf. The)[. The](https://www3.epa.gov/ttn/naaqs/standards/pm/data/HanleyandReff040711.pdf. The)[memo also provides a set of graphical outputs for comparing the most widely used FEMs to the one-page](memo also provides a set of graphical outputs for comparing the most widely used FEMs to the one-page)[ ](memo also provides a set of graphical outputs for comparing the most widely used FEMs to the one-page)assessments described in this technical note, allowing users to understand if their FEMs are consistent with FEMs operated in other agencies.  \nDescription of Data and Assessments:  \nThe following information describes the data and assessments in the one-page reports:  \nTable 1 – Dataset Descriptors  \n\n| Dataset | Short\u003Cbr>Descriptor | Color of\u003Cbr>descriptor or\u003Cbr>data points | Description |\n| --- | --- | --- | --- |\n| AllData | A | black | Represents all the data in the assessment |\n| Winter | W | blue | Winter is represented by the dates December 21 – March 20. |\n| Spring | R | green | Spring is represented by the dates March 21 – June 20. |\n| Summer | S | red | Summer is represented by the dates June 21 – September 20. |\n| Fall | F | brown | Fall is represented by the dates September 21– December 20. |\n| Year | 0-9 | black | Full calendar year |\n\nNote: Seasons are fixed dates regardless of year.  \nIllustration of Linear Regression Relationship:  \nOn the top left of the page a regression relationship is illustrated and the regression equation is presented along with the correlation of the equation. A 1:1 line is drawn as a solid line to quickly assess if data points are above, below, or straddling the 1:1 line. A dashed line is drawn as the regression relationship. The FRM is presented on the X-axis, while the continuous method is presented on the Y-axis.  \n1 In May 2018, the PM2 .5 continuous monitor comparability assessment was updated to account for multiple FRMs at the same site that are reported as separate POCs. The assessment uses the lowest available FRM POC available on a given day. The result of this change increases the available FRM samples to use in the assessment.  \nIllustration of Difference Trend:  \nOn the top right of the page a trend is illustrated based on the difference between the continuous and FRM method. Data are presented in a color coded manner to determine any seasonal patterns, should they exist.  \nPart ","cbCaiaxvyNsnNjCk","https://ap.wps.com/l/cbCaiaxvyNsnNjCk","pdf",450957,"English","# Summary\n## Interpretation approach\n## Data and assessment framework\n## Dataset descriptors and seasonal definitions\n## Linear regression relationship (1:1 and regression)\n## Difference trend illustration\n## Part 53 specifications (slope, intercept, correlation, CCV)\n## Mean and bias calculations\n## Referenced methods and appendices","[{\"question\":\"What does the PM2.5 continuous monitor comparability assessment evaluate?\",\"answer\":\"It assesses the comparability of a PM2.5 continuous monitor when collocated with an FRM sampler, supporting evaluation for intended monitoring objectives such as NAAQS comparison and/or AQI reporting.\"},{\"question\":\"How are results organized for interpretation?\",\"answer\":\"Data are summarized across fixed seasons for multiple years, by year, and for all data. Interpretation is recommended using either the entire dataset (AllData/A) or the last complete year.\"},{\"question\":\"Which benchmark tests and outputs are used in the assessment?\",\"answer\":\"The tool presents assessments in the context of benchmark tests, including linear regression comparisons, difference trend visuals, and Part 53-based criteria for slope/intercept and correlation relative to CCV, along with bias calculations using referenced equations.\"}]","PM2.5 Continuous Monitor Comparability Assessment Tool - Technical Note | PDF"]