Again, it depends on which parameters you're measuring. It also depends if you're looking at it at a national, regional, or local level. Air quality has gotten better in some areas, in some areas it's gotten worse. Water quality, better in some areas, in some areas worse. It's hard to generalize. I'd like to think that the environmental assessment process under other regulatory regimes has incrementally improved the situation over the early 1990s, but it would be hard to find evidence of that in all aspects.
On October 27th, 2011. See this statement in context.