There is nothing wrong with that...I am not an environmentalist by the
politically correct definition, but I see no reason not to take prudent
actions to keep the environment the most beneficial to humans - especially
if one's vehicle has started to emit more unburned hydrocarbons than it did
previously.  The OP didn't state what the HC content was at the previous
test, but a significant increase could indicate a developing problem.  I
don't have the answer, but I respect his question.