Clean air case clouds projects

The District of Columbia Court of Appeals ruled in May 14, 1999, that the EPA should set aside its pollution rule implemented in 1997. The decision is a major victory for the construction and construction equipment industries since the regulation would have a great impact on road construction projects. The 1997 EPA regulation tightened the air quality standards for ground-level ozone and particulate matter from 0.12 parts per million (ppm) of ozone measured over an hour to 0.08 ppm over eight hours.