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I wonder what would happen if phone manufacturers started integrating photo acoustic CO2 sensors in their phones?

They could alert when CO2 goes over 1500 ppm and say 'Warning:. Harmful air quality detected. Increase ventilation or move outdoors'.

The same sensor could also detect Ozone, CO or NOx using different LED's, thereby making a pretty good detector for common poisonous gasses.

A crowd-sourced map of such levels across a large geographic area (with outdoor/indoor data) would be interesting to look at.

Has anyone done something like this already?

CO2 data is hard to crowdsource because the sensors aren't yet built into phones, and tend to all be proprietary with no standard interface.