Regulation - LGIC

Proposed Approach for the Implementation of Odour-Based Standards and Guidelines

Regulation Number(s):
Ontario Regulation 419/05
Ontario Regulation 516/07
Instrument Type:
Regulation - LGIC
Bill or Act:
Environmental Protection Act
Summary of Decision:
MOE has made a decision to proceed with standards for Total Reduced Sulphur (TRS), Hydrogen Sulphide (H2S) and mercaptans. However, O. Reg. 419/05 has been amended to introduce an offence for exceedences of odour based standards only at a place where human activities regularly occur based on measurement results. Due to the complexities associated with modelling for a 10 minute averaging period, no offence has been created at this time for modelled results that involve a 10 minute average for an odour based standard. For more information, please see subsection 20 (2.2) of the amended regulation.

In addition, MOE intends to clarify the phrase "when human activities regularly occur" by providing more guidance on human receptors. Further guidance will also be considered on methods to assess the frequency of exceedences at human receptors and the use of modelling to assess odour based standards and guidelines with 10 minute averages. Further input from stakeholders will be sought on the guidance material before it is finalized.
Note: Health based standards have also been included for most of the substances for which odour based standards have been developed, as well as for most substances where odour based guidelines are identified.

Further Information:
Proposal Number:
Posting Date:
November 19, 2007
Summary of Proposal:
MOE is proposing to amend Ontario Regulation 419/05 (O.Reg. 419/05), made under the Environmental Protection Act, to introduce new or updated standards and guidelines. Some of the proposed standards and guidelines are based on a 10-minute averaging time assessment of concentrations for odorous substances. This proposal is to consider amendments to O.Reg. 419/05 to allow for the consideration of frequency and location in the assessment of odour impacts. If approved, O.Reg. 419/05 would be proposed to be amended, if required, to allow for this type of assessment for 10-minute air standards and guidelines.

Contact Address:
Minnie deJong
Manager -Human Toxicology and Air Standards Section
Ministry of the Environment
Standards Development Branch
40 St. Clair Avenue West
Floor 7th
Toronto Ontario
M4V 1M2
Phone: (416) 314-3748
Fax: (416) 327-2936
Effective Date:
August 31, 2007