In the mid 1990s, there was concern over outdoor air quality in the state. A study found that there 1996 revealed that there were more than 15 truck and bus depots within a one-mile radius of Roxbury, garaging more than 1,150 diesel vehicles. Roxbury is home to a 95% minority population and a 27% poverty rate. The excessive pollution from transportation caused a severe asthma epidemic especially in children. The youth led response began monitoring air quality in 1997 with the program AirBeat (sponsored by the U.S Environmental Protection Agency). The Massachusetts Department of Environmental Protection (MA DEP) began discussions on creating an ambient air quality regulation. Several grassroots organizations began community outreach, education and movements including marches, and sending postcards for justice. The mobilization level was high, in reaction to the asthma epidemic, especially in the youth. Also in reaction to studies that found a disproportionate number transit stations in Roxbury. There has been increased collaboration between community groups, environmental justice organizations and state/ federal environmental organizations. They have passed an anti-idling laws that have significantly reduced pollution levels. Community group, ACE, has been successful in 2009, by getting Capitol Waste Services, the largest residential trash hauler in Boston to install retrofits on 72 trucks. In 2011, ACE got Brigham and Women's Hospital, to commit to reducing diesel emissions on current and future projects. They are currently working on a Diesel Emissions Reduction Ordinance (DERO) for Boston, it would require pollution control technology on city owned and contracted diesel engines. Additionally, vehicles would use ultra low sulfur diesel fuel, and strictly adhere to state anti-idling laws.