Chemical Holograms?

[ChemistryQuest]

Hello, I’m writing a sci-fi story and had questions regarding my concept for how holograms could work in it. 

The idea is that an invisible, photo-reactive gas is released from an emitter, then computer-controlled lasers are fired to different points within the cloud to “draw” a 3D image out of glowing particles, sort of like how SLA resin printers work, only the particles would glow instead of solidifying from the lasers. Is this a viable concept? 

Secondarily, if this is feasible, how would various environmental factors like temperature and humidity affect these chemical holograms? Would they be able to be used outdoors? I had an idea for something called “H-smog,” which would be like a glowing smog created under certain conditions when the activated hologram particles sink to lower altitudes and collect in alleys and stuff. 

Thanks so much for your time! 

[ChemistryQuest]

Thank you for such an in-depth and detailed response! As this is a fictional work, as long as it’s scientifically “plausible” that such a thing could exist with technological development invested into creating it, then I am satisfied to use it as an element of a hypothetical future. As far as the environmental impact is concerned, it is something I was planning to have be addressed - the work is meant to be a dystopian world where the destruction of the environment for commercial purposes is one of the main issues the heroes must fight against. H-Smog produced by holographic advertisements leaching toxic chemicals into the air and water is just one example of that. 
thank you again for such a detailed response, I appreciate you taking the time to clarify these things!