Ronniejoe, I think(IMHO)we can never have air that is too clean. If you've been to Alaska, you know what I mean, and I've flown into LA before and watched how dark the cabin got as we decended through the cloud of smog. Have done the same in Mexico City, pollution is awful. Yesterday I was driving back from a family get together and came up behind an old 65 ford fairlane that looked like it had just come across the Mexican border that day. The smell was so bad even with my AC on inside air, I finally passed going uphill across the yellow stripe, I just couldn't stand it my eyes were watering.
Haven't we done enough? That experience yesterday told me we have done a bunch, unfortunately the rest of the world hasn't. Right now as you probably know the study I read about said that asma had increased in our small children in America due to the winds blowing smog from China.
I just hope our Engineers are given the chance to clean things up and not do something stupit like they did with the compression drop of the engines back in the 70's. NO one can legislate new technology, it has to be Engineered. I hope by now our Government rep's have learned that lesson.
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