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Sulfur dioxide limits and guidelines in Ontario (CA-ON)

4 numeric limits and guidelines for sulfur dioxide held for Ontario and the place above it, from 2 instruments, each cited to its instrument, edition, section or page and quoted text. The register was built from 273 instruments. Everything held for Ontario

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For programs: this page as JSON at /api/v1/limits?parameter=sulfur%20dioxide&place=CA-ON; the same at https://passage-data.com/mcp, a remote MCP server (tool find_limits). Every tool · llms.txt · OpenAPI

Ontario (CA-ON): 2 rows

ParameterValueUnitStatisticGovernsApplies whenCite
Sulphur Dioxide100µg/m³1-hour averageambient air · limitaveraging 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))		Ontario Regulation 419/05, Air Pollution
Schedule 3, item 88
88. 7446-09-5 Sulphur Dioxide 100 none 10; annual
Sulphur Dioxide10µg/m³annual averageambient air · limitaveraging period: annual
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))		Ontario Regulation 419/05, Air Pollution
Schedule 3, item 88
88. 7446-09-5 Sulphur Dioxide 100 none 10; annual

Canada (CA): 2 rows

ParameterValueUnitStatisticGovernsApplies whenCite
sulphur dioxide65ppbambient air · guidelineThe three-year average of the annual 99th percentile of the daily-maximum 1-hour average concentrations
2025		Canadian Ambient Air Quality Standards (CAAQS), environmental quality objectives under CEPA 1999 ss…
1 hour 70 ppb (see footnote 12*) 65 ppb The three-year average of the annual 99th percentile of the daily-maximum 1-hour average concentrations.
sulphur dioxide4.0ppbambient air · guidelineThe average over a single calendar year of all the 1-hour average concentrations
2025		Canadian Ambient Air Quality Standards (CAAQS), environmental quality objectives under CEPA 1999 ss…
Annual (1 year) 5.0 ppb 4.0 ppb The average over a single calendar year of all the 1-hour average concentrations.

Not held here: a discharge permit's own limits, and any rule for sulfur dioxide outside the 17 instruments we hold for this place and the places above it. A row missing here is missing from our sources, not from the law.

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What was searched

Every instrument we hold for Ontario (CA-ON) and the place above it, Canada (CA): 17 instruments, for every parameter name matching “sulfur dioxide”: sulfur dioxide, 1 decene polymer with sulfur dioxide, 2 aminoethanol compound with sulphur dioxide 1 1, 2 2 oxybisethanol reaction products with ammonia morpholine derivs residues reaction products with sulfur dioxide, ethanol 2 2 oxybis reaction products with ammonia morpholine derivs residues reaction products with sulfur dioxide.

  1. 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 · Canada Gazette, Part I, Volume 147, Number 21: GOVERNMENT NOTICES May 25, 2013 · source — 2 rows here
  2. Ontario Regulation 419/05, Air Pollution — Local Air Quality — Schedule 3, standards with variable averaging periods · Government of Ontario (Environmental Protection Act; Ministry of the Environment, Conservation and Parks) · 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 sha256 fb70ac7944efd8d2c48c508a8c045838d941dac28eb72b357b9a501b222ac17e — 2 rows here
15 instruments searched with no row for it
  1. CCME — Soil Quality Guidelines for the Protection of Environmental and Human Health (Summary Table, as served 2026-09-24) · Canadian Council of Ministers of the Environment (CCME) · Summary Table · source sha256 f484a5f2a2dfcb5a4257763c853fc8dc810788cec54c75355b30ec194e2f7499 — no row here
  2. CCME Canadian Water Quality Guidelines for the Protection of Aquatic Life — freshwater and marine, short and long term · Canadian Council of Ministers of the Environment (CCME) · Summary Table (as served 2026-09-24; each guideline carries its own year) · source sha256 f484a5f2a2dfcb5a4257763c853fc8dc810788cec54c75355b30ec194e2f7499 — no row here
  3. Fisheries Act (R.S.C. 1985, c. F-14), s. 36(3) — no deposit of a deleterious substance in water frequented by fish; no value printed · Government of Canada (Fisheries Act; Environment and Climate Change Canada administers s. 36) · Justice Laws Website, current to 2026-09-21, last amended 2024-11-27 · source sha256 db95b0a149728b0f0b1e1b1314d87ecdf46a91e1edfec4a7006fc3cbe0080bd6 — no row here
  4. Health Canada — Guidelines for Canadian Drinking Water Quality, Summary Tables 1-3 (microbiological, chemical and physical, radiological) · Health Canada, with the Federal-Provincial-Territorial Committee on Drinking Water · page modified 2026-01-21 (dcterms.modified; issued 2014-10-22): Tables 1-3 as the browser pane rendered them on 2026-10-15 · source sha256 9451ad8bfa566c0625ae4fcb362272cbb0e20040c548540f362488118c300b89 — no row here
  5. Health Canada, Objective for Canadian drinking water quality — per- and polyfluoroalkyl substances (published 2024-08-09) · Health Canada · Objective value · source sha256 32a42a0d382cdd90729dd9750f47889782bd00d4af8dfd34f2b9aaf6f2678c6c — no row here
  6. Metal and Diamond Mining Effluent Regulations (SOR/2002-222) — Schedule 4, maximum authorized concentrations · Government of Canada (Fisheries Act; Environment and Climate Change Canada) · Justice Laws Website, current to 2026-09-21 · source sha256 2c6e0151d3776378f73df4868ca98052882ee81faf9738bbeba6f5d544b648fe — no row here
  7. Meat and Poultry Products Plant Liquid Effluent Regulations (C.R.C., c. 818) — Schedule I authorized deposits · Government of Canada (Fisheries Act; Environment and Climate Change Canada) · Justice Laws Website, current to 2026-09-21 · source sha256 c60e2a2dfa9a10c2ddd314b391bf66215ad599732f38b4c5a15fe793d8c28841 — no row here
  8. Ontario — Soil, Ground Water and Sediment Standards for Use Under Part XV.1 of the Environmental Protection Act (April 15, 2011), Tables 1-9 — ground water · Ontario Ministry of the Environment · April 15, 2011 · source sha256 4062fa480e7483c42e6f5ea8d49a00ae1c0d0590002fa4989e58299786cf331b — no row here
  9. Ontario — Soil, Ground Water and Sediment Standards for Use Under Part XV.1 of the Environmental Protection Act (April 15, 2011), Tables 1-9 — soil · Ontario Ministry of the Environment · April 15, 2011 · source sha256 4062fa480e7483c42e6f5ea8d49a00ae1c0d0590002fa4989e58299786cf331b — no row here
  10. Ontario Regulation 169/03, Ontario Drinking Water Quality Standards — Schedules 1-3 · Government of Ontario (Safe Drinking Water Act, 2002) · consolidation period January 1, 2020 - e-Laws currency date (October 12, 2026); last amendment O. Reg. 457/16 · source sha256 b622b94b73c161ff6e2a474712cda6344eadfff705b8a5d312d57ce51df419d0 — no row here
  11. Provincial Water Quality Objectives (Ontario MOEE, Water Management: Policies, Guidelines, Provincial Water Quality Objectives, 1994) — Table 2, PWQOs and Interim PWQOs · Ontario Ministry of Environment and Energy (MOEE; now Ministry of the Environment, Conservation and Parks) · MOEE July 1994 (reprinted February 1999), as published on ontario.ca (fetched 2026-10-09) · source sha256 f4eddd3cd97cf5abb8678d040947bdaa2b4afae406f055948457d372d3b47931 — no row here
  12. Potato Processing Plant Liquid Effluent Regulations (C.R.C., c. 829) — Schedule I authorized deposits · Government of Canada (Fisheries Act; Environment and Climate Change Canada) · Justice Laws Website, current to 2026-09-21 · source sha256 691ca3953a6dd6ae66b4c72737944caa68ed76710447df642a16716dd25027a3 — no row here
  13. Pulp and Paper Effluent Regulations (SOR/92-269) — s. 14 maximum BOD and suspended solids · Government of Canada (Fisheries Act; Environment and Climate Change Canada) · Justice Laws Website, current to 2026-09-21 · source sha256 cc8432e6a4dd1834ff4dd43d5b5fb98f09b1f7af7952e36154febcc649504eb4 — no row here
  14. Petroleum Refinery Liquid Effluent Regulations (C.R.C., c. 828) — Schedule I authorized deposits · Government of Canada (Fisheries Act; Environment and Climate Change Canada) · Justice Laws Website, current to 2026-09-21 · source sha256 30e528bdc3a3546afb3defff4dae9b1dacb362e192680e127bd788d7f97c8ce8 — no row here
  15. Wastewater Systems Effluent Regulations (SOR/2012-139) — s. 6 effluent quality · Government of Canada (Fisheries Act; Environment and Climate Change Canada) · Justice Laws Website, current to 2026-09-21, last amended 2026-06-04 · source sha256 0a60e10f783f7aca672792303dffcca1525133eb34eb32711543cb3cf4bbb955 — no row here

Read from public law and public agency files. A row missing here is missing from our sources, not from the law of the place. Check the cited source before relying on a value.