Mid last September, we learnt about Martian ozone. Venus and Earth have polar vortices. It turns out that Mars, with an Earthlike axis but much less atmo, also produces ozone.
Mars might not produce all that much ozone; but when it does, the O3 stays there. Because the Martian caps are - presently - 40 K below the temperature of the rest of the planet. Also although the perchlorates might (I think) help produce those infamous CFCs, said perchlorates are locked in the Martian soil. To the extent they're kicked up in the dust storms they're not getting to the vortices.
Now: I don't know how long this will last, because unlike Earth (and I suspect Venus) Mars' tilt is unstable. Earth has a heavy moon. Mars has a couple of drifting rocks. As a result the feedstock of Mars' volatiles is eroding.
BACKDATE 10/19
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