I am from one of those developing countries. A chimney won't help you very much when everybody around you is burning coal/wood/plastic/rubber/bitumen for heat a

I am from one of those developing countries. A chimney won't help you very much when everybody around you is burning coal/wood/plastic/rubber/bitumen for heat and it's 300 µg/m³ outside. The common suggestion to "open a window" reads like a joke.