Emission permit system — a type of transferable permit system in which the permits are defined in terms of the right to emit a stipulated amount of emissions.

排放许可系统——转让许可系统的一种类型，这个许可确定了在权限方面可排放物总额排放的约定。

Indiana gave a permit to BP that allows it to increase emissions of ammonia and suspended solids (critics call it sludge) by 54% and 35% respectively.

印第安纳给了BP增加54%氨和35%悬浮粒(被批评者称为“污泥”)的排放许可。