1. Of, relating to, or existing in the atmosphere.
2. Produced by, dependent on, or coming from the atmosphere.
3. Resembling or representing the atmosphere; having or giving the effect of translucence: a painting suffused with a hazy, atmospheric glow.
4. Intended to evoke a particular emotional tone or aesthetic quality: lush atmospheric touches in every room.
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if you are interested in whether that "smoke" (mainly H2O and CO2) is "clean", there's some info here -- action.thisisreality.org/details