How air pollution influences clinical management of respiratory diseases. A case-crossover study in Milan

The paper also outlines a number of possible actions that EPA could take to ease the implementation of trading programs. These actions include providing guidance, technical and financial assistance, and explicit approval of trading as agency policy. Although EPA is considering drafting guidance for communities that wish to initiate their own pollutant trading projects, EPA officials told us that the number and variety of uncertainties surrounding trading have hindered ...