Jim,
Just so you understand the issue...pollens are not spores. Spores are very hard to kill but pollen is not. Like aithor said...in open air it doesn't live long. Couple weeks max. And while bleach is a good disinfectant...3/1 seems too strong to me. I'd dilute way more...and use good ventilation so you don't breath so much chlorine gas.
JD
Yes it is a strong mixture. However with that strong of a solution it leaves a residue behind that last a few hours. Sodium Hypochlorite degrades when heated but it left alone will last a few hours depending on how strong your solution is. If you have a stirred up room with pollen isnt just settled on the surfaces of things you can clean once and allow the room to settle and while in the process anything else that lands until the degrade of the sodium Hypochlorite simply dies. Including, mites, pollen, viruses, or anything else that is not resistant to it. BUT heat, sunlight, and a few other factors allows it to degrade much faster. Chlorine bleach itself evaporates at roughly .75 grams aday so you know.
Also have you ever poured bleach on your hand or even a diluted concentration of bleach on your hand? Do you remember the slight oily feeling between your fingers. That is the Sodium Hypochlorite. Even on your hands it lasts for a little while until degraded or heavily flushed with water.
It does work in aiding to remove pollen from your grow room. If you can handle the smell. What I use to do was clean the walls floor and tables or what ever you have in there. Turn off lights, fans and everything in between grows. and wait a few hours. I would clean the room twice if pollen was present to aid in future non pollination.
It works and it is cheap. Be careful if you have sensitive skin though. It is caustic with a PH around 11. And mixing it with any kind of acid makes it degrade rapidly releasing chlorine gas. Which you dont want to breath but can also be used to kill air borne containments in small spaces. Just make sure to evacuate any air in the room after you are done as it can kill you.
Hope this was somewhat informative and helpful.