{"query":{"parameter":"carbon monoxide","place":"US-MS","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-MS","US"],"parameter_keys":["cas:630-08-0"],"names_matched":[["carbon monoxide","cas:630-08-0"]],"match":"exact","order":"The place's own instruments first, then each place above it, each in its register's order"},"total":4,"offset":0,"returned":4,"next_offset":null,"rows":[{"id":"1680b6e36e7128f8","parameter":"carbon monoxide","value":"9","value_num":9,"unit":"ppm","direction":"max","kind":"limit","medium":"ambient_air","level":"national","parameter_key":"cas:630-08-0","place":["US"],"conditions":["not to be exceeded more than once per year"],"cite":{"instrument":"us_naaqs","title":"40 CFR Part 50, National Primary and Secondary Ambient Air Quality Standards, §§ 50.4–50.21 (eCFR as of 2026-08-01)","issuer":null,"edition":"90 FR 4651, Jan. 16, 2025","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=50","source_sha256":null,"fetched_at":null,"source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"§ 50.8 National primary ambient air quality standards for carbon monoxide.","page":null,"quote":"(1) 9 parts per million (10 milligrams per cubic meter) for an 8-hour average concentration not to be exceeded more than once per year","column":"valeur"}},{"id":"c7505e6147962f7a","parameter":"carbon monoxide","value":"10","value_num":10,"unit":"mg/m³","direction":"max","kind":"limit","medium":"ambient_air","level":"national","parameter_key":"cas:630-08-0","place":["US"],"conditions":["not to be exceeded more than once per year"],"cite":{"instrument":"us_naaqs","title":"40 CFR Part 50, National Primary and Secondary Ambient Air Quality Standards, §§ 50.4–50.21 (eCFR as of 2026-08-01)","issuer":null,"edition":"90 FR 4651, Jan. 16, 2025","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=50","source_sha256":null,"fetched_at":null,"source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"§ 50.8 National primary ambient air quality standards for carbon monoxide.","page":null,"quote":"(1) 9 parts per million (10 milligrams per cubic meter) for an 8-hour average concentration not to be exceeded more than once per year","column":"valeur"}},{"id":"7714b7addd51d1ab","parameter":"carbon monoxide","value":"35","value_num":35,"unit":"ppm","direction":"max","kind":"limit","medium":"ambient_air","level":"national","parameter_key":"cas:630-08-0","place":["US"],"conditions":["not to be exceeded more than once per year"],"cite":{"instrument":"us_naaqs","title":"40 CFR Part 50, National Primary and Secondary Ambient Air Quality Standards, §§ 50.4–50.21 (eCFR as of 2026-08-01)","issuer":null,"edition":"90 FR 4651, Jan. 16, 2025","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=50","source_sha256":null,"fetched_at":null,"source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"§ 50.8 National primary ambient air quality standards for carbon monoxide.","page":null,"quote":"(2) 35 parts per million (40 milligrams per cubic meter) for a 1-hour average concentration not to be exceeded more than once per year.","column":"valeur"}},{"id":"b56401feccb1b1c7","parameter":"carbon monoxide","value":"40","value_num":40,"unit":"mg/m³","direction":"max","kind":"limit","medium":"ambient_air","level":"national","parameter_key":"cas:630-08-0","place":["US"],"conditions":["not to be exceeded more than once per year"],"cite":{"instrument":"us_naaqs","title":"40 CFR Part 50, National Primary and Secondary Ambient Air Quality Standards, §§ 50.4–50.21 (eCFR as of 2026-08-01)","issuer":null,"edition":"90 FR 4651, Jan. 16, 2025","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-40.xml?part=50","source_sha256":null,"fetched_at":null,"source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"§ 50.8 National primary ambient air quality standards for carbon monoxide.","page":null,"quote":"(2) 35 parts per million (40 milligrams per cubic meter) for a 1-hour average concentration not to be exceeded more than once per year.","column":"valeur"}}],"next":[{"tool":"check_values","says":"Has your user measured this? check_values sets each of their results beside every row held here, with a verdict and the row's cite.","arguments":{"place":"US-MS"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"carbon monoxide\", value, unit}, ...], any other parameters too."},"post":"/api/v1/check"},{"tool":"read_certificate","says":"Has your user a laboratory certificate? read_certificate reads every row it prints, each with its page, and checks them against these limits.","arguments":{"place":"US-MS"},"needs":{"content_base64":"The laboratory's certificate (PDF) or its XLSX, XLS or CSV export, as base64; or file_url, a public https address of it."},"post":"/api/v1/certificate"}]}