system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Since there are no forests, is the oxygen supply in Coruscant artificially produced? How does it stay breathable for humans?
gpt
If recall from the book version of Phantom Menace the atmosphere is maintained through giant oxygen regulators/carbon dioxide scrubbers which filter and purify the air.  Even with this technology though, the lower you lived in the planet (lower level of buildings, deep down alleyways, etc), the more polluted the air tended to be.