Why are some industrial chimneys so high, like what’s the difference if it’s 150 or 300 meters?

Question

Why are some industrial chimneys so high, like what’s the difference if it’s 150 or 300 meters?

In: Engineering

Answer 1

Something I’ve not seen mentioned in other replies: It can depend a lot on local landscape and microclimate/airflow

e.g. a factory in a valley might need a taller stack to avoid issues with local smog.