Ontario Regulation 419/05
Air Pollution - Local Air Quality

Ontario Regulation 419/05, Air Pollution – Local Air Quality, has been introduced to better protect local communities from the impacts of air pollution. On November 30, 2005, Regulation 346 “General - Air Pollution” was revoked and replaced with Ontario Regulation 419: Air Pollution - Local Air Quality (O.Reg 419/05). Guidance documents have been developed to support the regulation.

Regulation Resources   Ontario Regulation 419/05 Air Pollution - Local Air Quality   2424e04 Summary of O. Reg. 419/05 Standards and Point of Impingement Guidelines and Ambient Air Quality Criteria (AAQCs) – Sorted Alphabetically (December 2005)   Frequently Asked Questions     Submit a Technical Question

Guidance Documents 3614e02 Guideline A-10: Procedure for Preparing an Emission Summary and Dispersion Modelling (ESDM) Report 5165e Guideline A-11: Air Dispersion Modelling Guideline for Ontario 5166e Guideline A-12: Guideline for the Implementation of Air Standards in Ontario

Air Standards

The Ministry of the Environment sets contaminant specific air quality standards to protect human health and the environment. The Ministry of the Environment's Standards Plan (released in 1996 and revised 1999) describes the types of standards used by the ministry, provides an overview of the standards-setting process, and lists the priorities for developing new or revised standards. The ministry maintains a current listing of air quality standards and guidelines for over 300 contaminants.

• Setting Air Standards in Ontario
• Summary of O. Reg. 419/05 Standards and Point of Impingement Guidelines and Ambient Air Quality Criteria (AAQCs) – Sorted Alphabetically (December 2005)
• Summary of O. Reg. 419/05 Standards and Point of Impingement Guidelines and Ambient Air Quality Criteria (AAQCs) – Sorted by CAS Number (December 2005)

Alternate Air Standards

Ontario Regulation 419/05 includes a risk-based process for alternative standards to address implementation issues related to new standards and/or new models. Implementation barriers include technical, economic or time-related issues.

Resources 5166e Guideline for the Implementation of Air Standards in Ontario     Guide to Requesting an Alternative Air Standard (Under Development) 6034e Fact Sheet on Setting Alternative Standards

Emission Summary And Dispersion Modelling Reports

Demonstration of compliance with Ontario Regulation 419/05 begins with the development of an Emission Summary and Dispersion Modelling (ESDM) Report that includes a summary of total air emissions from a property. Air emissions are then converted to Point Of Impingement concentrations using mathematical air dispersion models. The updated Procedure for the Preparation of an ESDM Report provides guidance on completing an ESDM report in accordance with the Regulation.

Procedure for Preparing an Emission Summary and Dispersion Modelling (ESDM) Report

Air Dispersion Models

The approved air dispersion models in O. Reg. 419/05 include both the original set of dispersion models in the Appendix to Regulation 346 as well as the additional approved dispersion models adopted from the United States Environmental Protection Agency (US EPA). The ASHRAE method of calculation can also be used for same structure contamination. These approved models are required to be used when assessing compliance with air standards and guidelines. Under certain circumstances, upon ministry approval, other dispersion models may be used to assess compliance.

Air Dispersion Modelling Resources Guidance Document 5165e Air Dispersion Modelling Guideline for Ontario Ontario Approved US EPA Air Dispersion Models This information is also available via the Public Information Center (PIBS# 5174e01)   SCREEN3     ISCPRIME     AERMOD   Reg. 346 Models 5208e Appendix to Regulation 346 General – Air Pollution As referenced in Reg. 419/05   Models in Appendix to Regulation 346     Models in Appendix to Regulation 346 User’s Manual   Same Structure Contamination - ASHRAE   ASHRAE Chapter 44 (Building Air Intake and Exhaust Design) of the ASHRAE Handbook — HVAC Applications, published by the American Society of Heating, Refrigerating and Air-Conditioning Engineers. (as amended and revised from time to time)   Other Dispersion Models (Ministry Approval Required For Use)   CALPUFF     CAL3QHCR     CALINE-4     SDM   Information Required for Running the Approved Models This information is also available via the Public Information Center 5081e01 Ontario Regional Meteorological Data 5106e Ontario Digital Elevation Model Data 5174e01 Ontario Regulation 419/05: Air Pollution – Local Air Quality: Approved Dispersion Models - Air, Version #2 - May 14, 2007. 5081e01 Ontario Regulation 419/05: Air Pollution – Local Air Quality: Ontario Regional Meteorological Data, Version #2 - May 14, 2007.

Forms

Forms 5350e Request for Approval under s.13(1) of Regulation 419/05 for use of Site Specific Meteorological Data 5352e Request Under s.7(1) of Regulation 419/05 for Use of a Specified Dispersion Model 5354e Notification of Exceedence – Regulation 419/05 5355e Request under s.20(4) to have the Schedule 3 Standards Apply in Advance of the Date Required by Regulation 419/05

Other Resources

Proposed Revisions to Odour-based Ambient Air Quality Criteria and Development of an Odour Policy Framework (EBR# PA05E0007)

Proposed Approach to the Implementation of Odour based Standards and Guidelines (EBR# RA06E0006)

Amendments to O.Reg 419/05 under the Environmental Protection Act (EBR# 010-0000)

Helpful Links

Environmental Assessment and Approvals Branch, Certificate of Approvals Website

Information on US EPA Emission Factors and Control Technology

North American Industrial Classification System (NAICS)

Determination of 1,6-Hexamethylene Diisocyanate (HDI) Emissions from Spray Booth Operations