The Department of Environmental Quality proposes to amend La. Admin. Code tit. 33, pt. III, §1101, which mandates that the shade or appearance of emissions from a combustion unit are not darker than 20 percent average opacity. The change modifies the list of activities that may be excepted from the rule, such as cleaning a fire box. http://www.doa.la.gov/osr/reg/1006/1006.pdf pp. 1321-1322.