Barcelona metro station air exchange

This is a video that shows the hashtag#AirExchange in a fraction of the underground Barcelona metro station.

The colour clouds represent the different concentrations of stale air (the highest Red is almost stale air 90-1200 g/m3 and the lowest Blue is almost fresh air 20-50 g/m3.

The blue plumes above the ground show the stale air coming out from the 8 station entrances, which immediately gets diluted with the fresh air outside. 

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