to place because of local variability in emissions reductions, the overall national average improvements in air quality for ... The differences in ambient concentrations of ground-level ozone and particulate matter under the two scenarios, however, are not so straightforward. ... The differences in ambient ozone concentrations estimated under the control scenario varied significantly from one ... The most important particle species, from a human health standpoint, are the fine particlesanbsp;...
|Title||:||The benefits and costs of the Clean Air Act, 1970 to 1990|
|Author||:||United States. Environmental Protection Agency, United States. Congress|