{"query":{"parameter":"nitrogen dioxide","place":"US-AK","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-AK","US"],"parameter_keys":["cas:10102-44-0","name:stickstoffoxide, angegeben als stickstoffdioxid","name:stickstoffoxide (stickstoffmonoxid und stickstoffdioxid), angegeben als stickstoffdioxid","name:ossidi di azoto (monossido e biossido), espressi come biossido di azoto"],"names_matched":[["nitrogen dioxide","cas:10102-44-0"],["stickstoffoxide angegeben als stickstoffdioxid","name:stickstoffoxide, angegeben als stickstoffdioxid","stickstoffdioxid"],["stickstoffoxide stickstoffmonoxid und stickstoffdioxid angegeben als stickstoffdioxid","name:stickstoffoxide (stickstoffmonoxid und stickstoffdioxid), angegeben als stickstoffdioxid","stickstoffdioxid"],["ossidi di azoto monossido e biossido espressi come biossido di azoto","name:ossidi di azoto (monossido e biossido), espressi come biossido di azoto","biossido di azoto"]],"match":"exact+contains","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":"1968ea8066c21519","parameter":"nitrogen dioxide","value":"53","value_num":53,"unit":"ppb","direction":"max","kind":"limit","medium":"ambient_air","level":"national","parameter_key":"cas:10102-44-0","place":["US"],"conditions":["annual average concentration in a calendar 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":"not verified"},"section":"§ 50.11 National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).","page":null,"quote":"(a) The level of the national primary annual ambient air quality standard for oxides of nitrogen is 53 parts per billion (ppb, which is 1 part in 1,000,000,000), annual average concentration, measured in the ambient air as nitrogen dioxide.","column":"valeur"}},{"id":"eaa4bd485465c936","parameter":"nitrogen dioxide","value":"100","value_num":100,"unit":"ppb","direction":"max","kind":"limit","medium":"ambient_air","level":"national","parameter_key":"cas:10102-44-0","place":["US"],"conditions":["three-year average of the annual 98th percentile of the daily maximum 1-hour average concentration"],"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":"not verified"},"section":"§ 50.11 National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).","page":null,"quote":"(b) The level of the national primary 1-hour ambient air quality standard for oxides of nitrogen is 100 ppb, 1-hour average concentration, measured in the ambient air as nitrogen dioxide.","column":"valeur"}},{"id":"138778c78b48a07c","parameter":"nitrogen dioxide","value":"0.053","value_num":0.053,"unit":"ppm","direction":"max","kind":"limit","medium":"ambient_air","level":"national","parameter_key":"cas:10102-44-0","place":["US"],"conditions":["annual arithmetic mean concentration"],"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":"not verified"},"section":"§ 50.11 National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).","page":null,"quote":"(c) The level of the national secondary ambient air quality standard for nitrogen dioxide is 0.053 parts per million (100 micrograms per cubic meter), annual arithmetic mean concentration.","column":"valeur"}},{"id":"8629acfd3d7b3798","parameter":"nitrogen dioxide","value":"100","value_num":100,"unit":"µg/m³","direction":"max","kind":"limit","medium":"ambient_air","level":"national","parameter_key":"cas:10102-44-0","place":["US"],"conditions":["annual arithmetic mean concentration"],"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":"not verified"},"section":"§ 50.11 National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).","page":null,"quote":"(c) The level of the national secondary ambient air quality standard for nitrogen dioxide is 0.053 parts per million (100 micrograms per cubic meter), annual arithmetic mean concentration.","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-AK"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"nitrogen dioxide\", 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-AK"},"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"}]}