Is unleaded gasoline 92 or 95?

Currently on the market at regular gas stations, 92 gasoline or 95 gasoline is unleaded. 92 gasoline is gasoline with an octane rating of 92 and n-heptane of 8, and 95 gasoline, which is 95% iso-octane and 3% n-heptane. Unleaded gasoline is gasoline that does not have tetraethyl lead added as an anti-shock additive in the refining process and contains less than 0.013g/L of lead.

Expanded Information

Using unleaded gasoline can effectively control harmful substances in automobile exhaust and reduce pollution such as hydrocarbons (HC causes smog), carbon monoxide (CO is poisonous), and nitrogen oxides (NOx forms acid rain).

To reduce emissions the most effective and easiest way is to install catalytic converters in the exhaust system, and gasoline lead content of more than 0.013 grams per liter will make the catalyst failure, so as not to achieve the purpose of controlling the car exhaust. This critical mass is the standard for defining unleaded gasoline.