Q-2, r. 4.1 - Clean Air Regulation

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26. The volatile organic compounds emitted into the atmosphere by printing activities may, for the combined activities of an establishment, exceed the limit prescribed by the first paragraph of section 19, provided that the emission of the substances by the operator is reduced by a percentage at least equal to the percentage set out in the following table, for each type of printing process, through the use of ink or other substances having a lower volatile organic compound content or the installation of a volatile organic compound emission reduction system:


Process Percentage of VOC
emission reduction



Flexography 90


Rotogravure 90


Offset lithography with heatset ink 90


Offset lithography without heatset ink 70


Letterpress printing 70

O.C. 501-2011, s. 26; O.C. 1060-2015, s. 1.
26. The volatile organic compounds emitted into the atmosphere by printing activities may, for the combined activities of an establishment, exceed the limit prescribed by the first paragraph of section 19, provided that the emission of the substances by the operator is reduced by a percentage at least equal to the percentage set out in the following table, for each type of printing process, through the use of ink or other substances having a lower volatile organic compound content or the installation of a volatile organic compound emission reduction system:


Process Percentage of VOC
emission reduction



Flexography 90


Rotogravure 90


Offset lithography with heatset ink 90


Offset lithography without heatset ink 70


Letterpress printing 70

For the purposes of this section, the emission reduction percentages are calculated on a monthly basis using the following reference parameters:


Process Solvent Ink density Percentage of
density (kg/l) solids (in volume)
(kg/l) in ink


Flexography 0.8 1.1 25


Rotogravure 0.8 1.0 25


Offset lithography 0.8 1.0 60


Letterpress printing 0.8 1.0 60


O.C. 501-2011, s. 26.