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How Much Are You 'Smoking' by Breathing Urban Air?

A new app can tell you (and it’s not pretty).  
A heavy layer of smog over Paris
A heavy layer of smog over ParisPhilippe Wojazer/Reuters

Have you ever wondered how many cigarettes you’re passively smoking while walking through the streets of a polluted, smog-infused city? No?

Well, a pair of digital developers just invented an app that will definitely (and accurately) answer that question. (Attention, smokers: You might want to quit after reading this.)