A long-running project to widen the 710 Freeway hit a new hurdle after the EPA has required planners to conduct a detailed pollution study that is likely to show added truck traffic will increase pollution in an area already burdened by bad air. - ADVERTISEMENT - The Environmental Protection Agency issued a letter in March requiring that officials behind the 710 Freeway widening project—which would add two lanes of truck traffic on either side of the freeway—perform a particulate matter “hot-spot” analysis. Not completing the analysis would put the project in non-compliance with the Clean Air Act, federal officials said.