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Any way you can do your experiments with a fume hood rather than using a gas mask?
I don't know what you're doing, but if you don't have a fume hood, do it outside. If you're outside and still generating enough NO2 to be concerned for your own safety, you shouldn't be doing it.What scale are you working on? Almost everything is safer when done smaller. If generation of lots of NO2 and or SO2 is necessary for whatever reason, see if you can bubble the exhaust from your reaction through an ice-cold sodium hydroxide solution before releasing it to the atmosphere. (You could even calculate how much NaOH is necessary to quench your fumes...)
If you choose to run the exhaust through something, a filter tube filled with granular NaOH would probably be sufficient, and easier to deal with the high flow your fume hood would be producing. However, sodium bicarbonate (NaHCO3) would be sufficient to neutralize your acid, and much safer to be using. Perhaps even a calcium carbonate (CaCO3).