20. The prohibition under section 19 does not apply to the manufacturing of insecticides, pesticides or herbicides or to the use of halocarbons.
The activities referred to in the provisions of subdivisions 1 and 3 to 8 of Division III of this Chapter are also excluded from the application of section 19.
In addition, the activities referred to in the provisions of subdivision 2 of Division III of this Chapter are excluded from the application of the second paragraph of section 19.