(1) it's a violation of this statute if a person operates, drives & causes or permits to be driven on any highway:

(a) a motor vehicle, other than one described in paragraph (b), that has visible emissions exceeding visible emissions allowed under Visible Emission Standard I under 815.195 (visible emission limits - requirements & standards)

(b) A motor vehicle powered by compression ignition, two cycle or diesel cycle engines or a vehicle excluded by order of the Environmental Quality Commission under 468A.075 (Variances from air contamination rules and standards) & the vehicle has visible emissions exceeding visible emissions allowed under Visible Emission Standard II under 815.195 (visible emission limits - requirements & standards)

(2) the exemptions from this section are established under 815.205 (visible emission limits - exemptions)