The document discusses why CleanAir's MET-80 is the best solution for mercury monitoring under the Mercury and Air Toxics Standards (MATS) regulation. It notes that MATS requires 24/7 mercury monitoring and compliance starts in less than 8 months. It then summarizes CleanAir's experience with mercury monitoring systems, including over 40 MET-80 systems installed prior to MATS with millions of operating hours, and their focus on reliability, robustness, and support.