{"query":{"parameter":"nitrogen dioxide","place":"CA-ON","medium":null,"statistic":null,"kind":null},"searched":{"places":["CA-ON","CA"],"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":"e01a15ac343a3b84","parameter":"Nitrogen Oxides","value":"400","value_num":400,"unit":"µg/m³","statistic":"hourly_avg","direction":"max","kind":"limit","medium":"ambient_air","level":"regional","parameter_key":"cas:10102-44-0","place":["CA-ON"],"conditions":["averaging period: 1 hour","at a point of impingement: the concentration the discharge results in, or would result in according to an approved dispersion model (s. 20 (1), (2)); s. 20 binds every facility's discharges on or after February 1, 2020 (s. 20 (3)(e))"],"cite":{"instrument":"ca_on_419_05","title":"Ontario Regulation 419/05, Air Pollution — Local Air Quality — Schedule 3, standards with variable averaging periods","issuer":"Government of Ontario (Environmental Protection Act; Ministry of the Environment, Conservation and Parks)","edition":"consolidation period July 1, 2023 - e-Laws currency date; last amendment O. Reg. 90/22 (held snapshot of 2026-09-19, saved through the browser pane; e-Laws checked 2026-10-15: the same consolidation, currency date October 12, 2026)","source_url":"https://www.ontario.ca/laws/regulation/050419","source_sha256":"fb70ac7944efd8d2c48c508a8c045838d941dac28eb72b357b9a501b222ac17e","fetched_at":"2026-09-19","section":"Schedule 3, item 76","page":null,"quote":"76. 10102-44-0 Nitrogen Oxides 400 200 none"}},{"id":"f941c1198e6570f7","parameter":"Nitrogen Oxides","value":"200","value_num":200,"unit":"µg/m³","statistic":"daily_avg","direction":"max","kind":"limit","medium":"ambient_air","level":"regional","parameter_key":"cas:10102-44-0","place":["CA-ON"],"conditions":["averaging period: 24 hour","at a point of impingement: the concentration the discharge results in, or would result in according to an approved dispersion model (s. 20 (1), (2)); s. 20 binds every facility's discharges on or after February 1, 2020 (s. 20 (3)(e))"],"cite":{"instrument":"ca_on_419_05","title":"Ontario Regulation 419/05, Air Pollution — Local Air Quality — Schedule 3, standards with variable averaging periods","issuer":"Government of Ontario (Environmental Protection Act; Ministry of the Environment, Conservation and Parks)","edition":"consolidation period July 1, 2023 - e-Laws currency date; last amendment O. Reg. 90/22 (held snapshot of 2026-09-19, saved through the browser pane; e-Laws checked 2026-10-15: the same consolidation, currency date October 12, 2026)","source_url":"https://www.ontario.ca/laws/regulation/050419","source_sha256":"fb70ac7944efd8d2c48c508a8c045838d941dac28eb72b357b9a501b222ac17e","fetched_at":"2026-09-19","section":"Schedule 3, item 76","page":null,"quote":"76. 10102-44-0 Nitrogen Oxides 400 200 none"}},{"id":"a36b20632b17c180","parameter":"nitrogen dioxide","value":"42","value_num":42,"unit":"ppb","direction":"max","kind":"guideline","medium":"ambient_air","level":"national","parameter_key":"cas:10102-44-0","place":["CA"],"conditions":["Three-year average of the annual 98th percentile of the daily-maximum 1-hour average concentrations","2025"],"cite":{"instrument":"ca_caaqs","title":"Canadian Ambient Air Quality Standards (CAAQS), environmental quality objectives under CEPA 1999 ss. 54(1) and 55(1): Objectives for Ambient PM2.5 and Ozone, Annex paras 1-4 and footnotes 1-2, Canada Gazette Part I, Vol. 147, No. 21, May 25, 2013","issuer":null,"edition":"Canada Gazette, Part I, Volume 147, Number 21: GOVERNMENT NOTICES May 25, 2013","source_url":"https://gazette.gc.ca/rp-pr/p1/2013/2013-05-25/html/notice-avis-eng.html","source_sha256":null,"fetched_at":null,"source_status":{"checked":"2026-10-15","status":"not verified"},"section":null,"page":null,"quote":"1 hour 60 ppb (see note a) 42 ppb Three-year average of the annual 98th percentile of the daily-maximum 1-hour average concentrations","column":"valeur"}},{"id":"ab1c2a29b2da9153","parameter":"nitrogen dioxide","value":"12.0","value_num":12,"unit":"ppb","direction":"max","kind":"guideline","medium":"ambient_air","level":"national","parameter_key":"cas:10102-44-0","place":["CA"],"conditions":["Average over a single calendar year of all the 1-hour average concentrations","2025"],"cite":{"instrument":"ca_caaqs","title":"Canadian Ambient Air Quality Standards (CAAQS), environmental quality objectives under CEPA 1999 ss. 54(1) and 55(1): Objectives for Ambient PM2.5 and Ozone, Annex paras 1-4 and footnotes 1-2, Canada Gazette Part I, Vol. 147, No. 21, May 25, 2013","issuer":null,"edition":"Canada Gazette, Part I, Volume 147, Number 21: GOVERNMENT NOTICES May 25, 2013","source_url":"https://gazette.gc.ca/rp-pr/p1/2013/2013-05-25/html/notice-avis-eng.html","source_sha256":null,"fetched_at":null,"source_status":{"checked":"2026-10-15","status":"not verified"},"section":null,"page":null,"quote":"Annual (1 year) 17.0 ppb 12.0 ppb Average over a single calendar year of all the 1-hour average concentrations","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":"CA-ON"},"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":"CA-ON"},"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"}]}