Our business focus is mercury reduction in flue gas emissions from large coal-fired utility and industrial boilers. This market is primarily based on air pollution control regulations and enforcement of those regulations. Any significant change in these regulations would have a dramatic effect on the Company, especially in North America (and primarily the United States) which is currently the largest market for our technology. Specifically, on December 16, 2011, the EPA published the Mercury and Air Toxics Standards (MATS), which sets forth federal mercury emission levels. Power plants were required to begin complying with MATS on April 16, 2015, unless they were granted a one-year extension to begin to comply. The MATS regulation has been subject to legal challenge, and in June 2015, the U.S. Supreme Court held that the EPA unreasonably failed to consider costs in determining whether it is "appropriate and necessary" to regulate hazardous air pollutants, including mercury, from power plants. The Court remanded the case back to the U.S. Court of Appeals for the District of Columbia Circuit for further proceedings, but left the rule in place. In December 2015, the D.C. Circuit remanded the rule back to the EPA for further consideration while allowing MATS to remain in effect pending the EPA's finding; the Supreme Court later denied a petition challenging the lower court's decision to remand without vacating. On April 14, 2016, EPA issued a final supplemental finding reaffirming the MATS rule on the ground that it is supported by the cost analysis the Supreme Court required. That supplemental finding is under review by the D.C. Circuit, and the Company is unable to predict with certainty the outcome of these proceedings. On April 18, 2017, EPA asked the court to place that litigation in abeyance, stating that the Agency is reviewing the supplemental finding to determine whether it should be reconsidered in whole or in part. The court granted EPA's abeyance request on April 27, 2017, and ordered EPA to file 90-day status reports starting July 26, 2017. In February 2019, the EPA published its proposed revised supplemental cost-benefits finding for MATS which concludes that the 2016 supplemental finding was flawed in part due to its reliance on co-benefits to justify MATS. Nevertheless, the EPA is proposing to leave the MATS rule in place. EPA also seeks public comment, however, on whether MATS may or must be rescinded if EPA reverses its earlier conclusion that it is "appropriate and necessary" to regulate power plant emissions of mercury and other hazardous air pollutants under the statutory provision authorizing MATS. The revised supplemental cost-benefits finding is subject to a public comment period until April 17, 2019. As of the date of the filing of this report, we are unable to predict whether the proposed supplemental cost-benefits finding will be finalized in substantially the form as proposed, or finalized at all. Any such final action will almost certainly be challenged in the courts, which could extend uncertainty over the status of MATS for a number of years. Investors should note that any changes to the MATS rule could have a negative impact on our business.