# POCP: How many ozone molecules can be created by one ethene molecule?

One ethane molecule can create two molecules of ozone, one ethanol molecule can create one molecule of ozone:

In the following table the POCP is twice as high for ethene than for propane:

From this fact I expect four molecules of ozone from ethene, but in my own formulated reaction mechanism I get only three ozone molecules:

How many ozone molecules can be created by one ethene molecule and if my proposed mechanism is wrong what is the correct one?

I think this question cannot be answered so easily - your proposed reaction mechanism, however, looks good. A detailed explanation and "main reaction mechanism" can be found here, page 192 (just search for "ethene" in the book). As you already indicate ethene reacts with a hydroxyl radical, followed by the addition of oxygen. The reaction with NO generates the HOCH$_2$CH$_2$O radical which can either dissociate or react with another oxygen molecule.