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by andy_ppp
2409 days ago
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Maybe people are more negative because of traffic, noise and frustrated about getting to work later. I find it hard to imagine a way to control for this short of making people breathe these substances separately and seeing if they actually do have lower IQs. You can then control for the other factors. These all seem to be epidemiological studies that we can't show the pollution is for sure the root cause. It could, for example, be that pollution is 25% of the result for example with more noise, traffic, irritation etc. being the other 75%. |
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