The Environmental Protection Agency (EPA) has approved a statement from Maryland's state government, declaring that there are no Sewage Sludge Incineration (SSI) units in Maryland. This approval follows the Clean Air Act guidelines, which require states to manage emissions from such units. Maryland certified in April 2020 that no SSI units exist within its borders, which means they do not need to submit a detailed plan for controlling emissions from them. This rule is effective as of March 11, 2021.
Simple Explanation
The EPA said that Maryland doesn't have any special machines that burn sewage waste to get rid of it, so Maryland doesn't need a plan to control smoke from those machines.