Automobile emissions testing is required in all or part of 33 states to help maintain the federal air quality standard. Areas that were in moderate nonattainment or worse for ozone in 1990 are included in Ohio's E-Check program. These areas include the metropolitan statistical areas of Cleveland and Akron.
Freebase(0.00 / 0 votes)Rate this definition: Alcohol proof. Alcohol proof is a measure of how much alcohol is contained in an alcoholic beverage. The term was originally used in the United Kingdom and was defined as 7/4 times the alcohol by volume.
9.2k Views. In the US, we use a measure for alcohol called Alcohol proof. 200 proof is pure alcohol and 100 proof is 50%. The reason this measurement system exists is because 100 proof is the minimum level where the liquid is flammable. So, 50% is the minimum. ==Edit==. A little more research and I came across this: