As vehicle combustion has gotten cleaner, simple evaporative emissions of raw gasoline has become a major contributor to smog & air quality. Old style half-empt

As vehicle combustion has gotten cleaner, simple evaporative emissions of raw gasoline has become a major contributor to smog & air quality. Old style half-empty gas cans in a hot garage are also hazardous, and have blown up many a garage according to my auto mechanic father.