The Clean Air Act already had required many of these states to produce plans for limiting this pollution by 1994. EPA is now mandating that states meet the requirements of the law. As part of this mandate, EPA developed a NO x emission limit, or cap, for each state, representing significant reductions in both small and large sources of pollution. The states must now come up with workable plans for achieving these caps.
Smokestacks are one source of NOx emissions.
Unfortunately, many stakeholders, including some states as well as pollution sources, are challenging EPA's rule, threatening either to sue EPA or ignore the caps. They've had more than enough time. EDF urges members to push for more breathable air for their children and themselves.