PM2.5: Mass Killer or Mass Fraud?

Whatever eventually turns out to be the truth, it’s hard to argue that PM2,5 is good for us. I am pretty sure that the current regulation is much overblown as we go into areas where this stuff is hardly detectable. But I have spent more than one cursory moment in cities like Cairo, Lagos, Tehran, Dheli, and a number of other far Eastern cities to know that smog is a bad thing. I lived in Paris for years and on certain days during summer, the smog mixed with calm weather to create a yellow dome around and above the city. One could literally smell and taste the air. Current regulations and the aims for more are often risible – but on a lesser level, I am very much in favor of some exhaust gas treatment. 

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