2009 NASM Odour Guide for
Ontario Regulation 267/03 made under the Nutrient Management
Part 5 - Basic Method: NASM Odour Category Table
Comparative and empirical assessment, the professional judgment
of ministry staff and a review of odour regulations and standards
in other jurisdictions were used to determine where NASM of different
types generally fit within the NASM odour categories. The odour
categorizations assigned in accordance with the NASM Odour Category
Table, Table 3 of the document titled Nutrient Management Tables,
corresponds to the level of odour generally emitted by each NASM
Given the variability in NASM and their odours, some NASM have
been assigned to OC3 even though individual examples of that NASM
may fit within OC2 or OC1.
NASM that does not fit within the NASM odour category generally
applicable to that NASM must be categorized using one of the other
methods described in this guide.
When mixing different types of NASM together, the mixture is assumed
to have the odour category of the most odorous material in the mixture.
For example, if an OC2 material is mixed with OC3 material, the
resulting mixture is assumed to be OC3.
Section 6.0 of this guide discusses the procedure for classifying
NASM that is not listed in Table 3 of the Nutrient Management Tables
and NASM that does not fit within the NASM odour category generally
applicable to that NASM.