“Statlab” by Dutch artist Tjerk Stoop, is an environmental art project that samples local air quality and displays the average CO2 levels through a chemical reaction where chalk particles are dynamically formed. The result is a graph “where the difference in the amount of chalk particles per tank is a global measure for the fluctuating CO2 concentration within one week.” Interesting visualization of pollution information with a nice visual aesthetic that renders typical scientific data more palatable to the average citizen. Check out the link below for lots more info on this installation.