Both cleaner vehicles and cleaner fuels will contribute to further improvement, he explained, with "annual emission reductions from the use of Ultra Low Sulfur Diesel with cleaner technology engines equivalent to removing the pollution from more than 90% of today's trucks and buses by 2030." Steichen said moving forward with the proposed new standards could "impact citizens while they are still suffering from a severe recession, in the very communities where we need to be creating jobs."
On January 7, U.S. EPA proposed the strictest health standards to date for ground-level ozone or smog -- proposing a rule to set the "primary" standard, which protects public health, at a level between 0.060 and 0.070 parts per million (ppm) measured over eight hours. The current primary 8-hour standard is 0.075 ppm [See WIMS 1/7/10]. EPA is also proposing to set a separate "secondary" standard to protect the environment, especially plants and trees -- proposing to set the level of the secondary standard within the range of 7-15 ppm-hours. The current secondary standard is the same as the primary standard -- 0.075 ppm.
Despite contrary testimony from EDF and others and information from EPA, Dr. Robyn Prueitt testified on behalf of API indicating that "controlled human exposure studies do not support an association between ozone exposure and adverse respiratory effects below 0.08 ppm. . . The epidemiological evidence for short-term health effects of ozone is weak and does not support causality at levels below 0.08 ppm. . . Health effects are attributed to ozone exposure when PM-related associations are not accounted for. . . [and] There are many issues with EPA's scientific method."
Access a release from API with links to Steichen's complete testimony and Dr. Robyn Prueitt's testimony on behalf of API analyzing the scientific research on the impacts of ozone on health (click here). Access a release on the EDF testimony and link to related information (click here). Access links to extensive background information including a fact sheet, hearing recordings, and the proposed rule from EPA's website (click here). Access the EPA docket for background and to review & submit comments (click here).