At ground level, this chemical compound is a pollutant that cracks rubber.
At ground level, this chemical compound is a pollutant that cracks rubber. This compound is measured in Dobson units and is the subject of the Montreal protocol, which led to the widespread replacement of (*) CFCs. For 10 points, name this molecule with chemical formula O3 ["OÂ­3"], which blocks UV rays in an important layerof the atmosphere.
At ground level, this chemical compound is a pollutant that cracks rubber.
ozone (accept O3 before mention)