The worst and best places to breathe in: Living in Prague is the same as smoking four cigarettes a day

Did you know that it takes two trees to cover one person's daily need of oxygen? The moment we were born, we got a slap on the butt to make us breathe. Pretty funny, right? The first breath, by the way, is the strongest breath of our lives. It's almost four times as strong as any breath we take after. Experts have been drawing attention to the serious problem of breathing in unhealthy environments for several years now.