After the new Cross-State Pollution rule by the EPA was passed at the end of 2011, some power companies were worried about the effect it would have on their ability to produce. This concern was borne out of the potential cost and time it would take to fit these plants with the proper filters for reducing the emissions to a safe level under the new guidelines.
As a result of this worry, many Texas-based power companies asked for the date of implementation to be pushed back from January 1st of 2012. When this was denied by the EPA, these companies took it a step further. A D.C. circuit court granted the request that the EPA wouldn't, effectively stopping this new law.
This means that until the hearing in the spring, the old laws for governing emissions will remain while investigators for both the court and the EPA take another look at the law to find the places where it can be improved as well as which aspects would cause the cited 'irreparable harm' that many power companies claim it will cause.
Until new legislation is passed, emissions are expected to remain high. If you'd like to remove that pollution from your breathing air, consider investing in a medical-grade home air purifier to keep the air in your home clean and healthy for you and your family.