Particulate produced by ART fleet.
Release & Savings of Particulate Matter by ART Fleet, 2007-2014 (pounds)
|Year||Savings of Particulate Matter (by Using CNG Buses)||Release of Particulate Matter by ART Fleet|
Fleet Composition by Fuel Type
|Year||Diesel Buses||CNG Buses|
This measure tracks particulate matter emitted from ART buses annually. The ART fleet is 100 percent powered by compressed natural gas (CNG). For comparative purposes, the particulate matter from a hypothetical all diesel ART fleet also was calculated to understand the positive environmental impacts of the all CNG fleet. Although CNG powered buses still produce particulate, they do so at a much lower rate when compared to the most common type of bus used for fixed-route transit service, diesel.
Numerous studies have linked greenhouse gases, particularly particulate matter, to climate change and respiratory illnesses. Tracking ART’s contribution to greenhouse gases in the atmosphere will help the agency evaluate how effective new vehicle purchases have been in mitigating greenhouse gas emissions and avoiding local air quality impacts. This measure supports to the MTP Goal 6: Advance Environmental Sustainability.
If the ART fleet was 100 percent diesel powered, particulate matter emissions from diesel vehicles would have totaled 16,545 pounds in 2014. However, ART’s fleet is almost entirely powered by compressed natural gas. With the current fleet make-up, the particulate matter emissions were only 3,309 pounds in 2014, or 80% lower than they would have been with a diesel fleet. As ART has replaced diesel vehicles with CNG-fueled vehicles, the County has avoided a total of 55,034 pounds of particulate matter from being released into the atmosphere since 2009.
- Transit Bureau, Annual ART Gasoline Gallon Equivalents (GGEs) and Fleet Annual Miles, 2006- 2014.
- EPA emission factors for diesel and CNG buses.