Lawyers for the oil industry say the vast majority of the plaintiffs have given them data that show very low levels of MTBE contamination in the small parts per billion category.
Airborne contamination continues to cross the western states, the new data shows, and Boise has seen the highest concentrations of radioactive isotopes in rain so far.
The Beijing News urges the environment ministry to stop treating pollution data as "state secrets" after it turned down requests to release the findings of a survey into groundwater contamination in 200 cities across the country.