Since the Martian atmosphere has a tiny fractional proportion of Oxygen in C02, how about a belt carrying miniature trees each with a stalked LED to light to photosynthesis. Oxygen will ebb out and each person will have there own personal O2 column.
Constant Martian-scaping will be needed to stimulate new growth and boost Oxygen output. Although, due to Martians having to be multi-talented people, the chosen topiary designs will be up to each individual.
Currently the wind belt is still in development, as gas ratios need tweaking in a more upward direction. These future steps in development will been seen via the fields of plant pharmaceuticals and the some clever CRISPR-cas9 flourishes.
Wind Belt, a belt of life. Note: Product is vaporwear.-- wjt, Sep 22 2019 How many plants would you need to generate oxygen for yourself in an airlock? https://io9.gizmodo...xygen-for-y-5955071A leaf gives off about five milliliters of oxygen per hour. [Voice, Sep 22 2019] ^ Money for old rope ...-- 8th of 7, Sep 22 2019 Nice, a belt of living hemp. Some genetic riffling with some air plants may be in order, though.-- wjt, Sep 22 2019 The plants could be hydroponic. Accessing a nearby source of nutrient-rich water would be piss easy ...-- 8th of 7, Sep 22 2019 So not a belt, more of a longer, thicker, wet kilt of phytoplankton.-- wjt, Sep 23 2019 I thought plants mainly breathed (brothe?) at night, instead photosynthesizing in the day.-- notexactly, Sep 24 2019 //I thought plants mainly breathed (brothe?) at night, instead photosynthesizing in the day.//
Some plants (wikipedia says "about 3% of all terrestrial species") effectively separate initial carbon fixation and photosynthesis, which can give them an advantage under various conditions (drought, low [C02], high temperatures etc). This is called C4 carbon fixation. Most plants do both at once, fixing C02 directly.-- Loris, Sep 24 2019 Good to know; thanks for the info.-- notexactly, Sep 24 2019 random, halfbakery