La. Navigation and Shipping § 34:841
It shall be unlawful for the captain or pilot or anyone acting under the orders thereof of any vessel, as defined in R.S. 34:801, operating a vessel on the Mississippi River to "blow the stacks" on the vessel while the vessel is in port. As used in this Section to "blow the stacks" means to clean out the conduits and pipes of the vessel by the use of compressed air or steam from the boilers in such a manner that smoke, soot, oil residue, or other pollutants are released through the stacks of the vessel into the air.
Whoever violates the provisions of this Section shall be guilty of a misdemeanor and shall, upon conviction, be fined not less than two hundred dollars nor more than five hundred dollars or be imprisoned for not more than six months, or both.
La. Navigation and Shipping § 34:841