The ability to change direction in the light of new evidence seems absent from the decision process. Re-examine the Key Strategic Role of Metro Metro is the central transit authority in the region and as such must take a much stronger lead in pollution mitigation. Metro should be charged by public officials with large pollution reductions within its own fleet and with achieving aggressive goals of new ridership by 2007. This latter is entirely about marketing and service. While all trees and vegetation produce reactive volatile gases, they also cool the air and mitigate ozone production and dispersion.
Vegetative surfaces remove gaseous pollutants from the air, particularly when they are wet or damp.
They also remove some particulates from the air. NASA has found plants to be one of the most efficient and effective mechanisms for cleaning the air of contaminants.