{"abstract":"We, the Environmental Protection Agency, are proposing to amend five instrumental test methods that are used to measure air pollutant emissions from stationary sources. The intended effect of this rule is to harmonize, simplify, and update the test methods. The methods were originally developed for specific industry applications but have since been adapted to general testing applications. These proposed revisions would remove inconsistencies in equipment and performance specifications so each method would be similar in these respects and have expanded applicability. We are also proposing to add helpful calculation procedures, quality assurance recommendations, and provisions for sampling at low concentrations. A large number of industries are already subject to the provisions requiring the use of these methods. Some of the affected industries and their Standard Industrial Classification codes are listed under SUPPLEMENTARY INFORMATION.","action":"Proposed rule.","agencies":[{"raw_name":"ENVIRONMENTAL PROTECTION AGENCY","name":"Environmental Protection Agency","id":145,"url":"https://www.federalregister.gov/agencies/environmental-protection-agency","json_url":"https://www.federalregister.gov/api/v1/agencies/145","parent_id":null,"slug":"environmental-protection-agency"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2003/10/10/03-24909.html","cfr_references":[{"chapter":null,"citation_url":null,"part":60,"title":40}],"citation":"68 FR 58838","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"Comments: Submit comments on or before December 9, 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