Dust control measures must be implemented in any livestock activity so that dust emissions do not exceed 20% opacity. (For more information about dust opacity, see the Dust Abatement Handbook § 9-1.)

Livestock activities include any activity directly related to feeding animals, racing animals, exercising animals, or any related activities. Dust control regulations apply to (among others): horse corrals, horse arenas, livestock pens, feed lots, and areas used to exercise animals.