The gases being detected at Andrews Bus Garage include Carbon Monoxide (CO), Nitrogen Dioxide (NO2), and Methane (CH4). Each gas is detected at two levels, a Warning level and an Alarm level. The current Warning and Alarm levels were established in coordination with WMATA's Fire Marshal's Office and Industrial Hygienist at the time or original installation. The gas sensors are registering Warning and Alarm levels frequently causing disruption to normal operations in the facility.

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