In the first commitment period of the Kyoto Protocol, how many greenhouse gases were covered for reducing their emissions?

The Kyoto Protocol's first commitment period covered six greenhouse gases for emission reduction.

A count of four leaves out some of the fluorinated gases that the protocol clearly listed.

A count of five is one short, missing one of the six controlled gases.

A count of seven matches the later Doha Amendment, not the original first period.

The six gases were carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons and sulphur hexafluoride.

Nitrogen trifluoride became the seventh gas only in the second commitment period under the Doha Amendment.