Evaporation of concentrated formic acid and semi-concentrated sulfuric acid at room temperature I recently looked at a reaction where CO is synthesized using formic acid and sulfuric acid, which seems to be one of the easier to control reactions for this, and obviously ventilation etc is necessary.

However I was wondering, is ventilation only necessary because of the dangerous nature of CO, or also because of the vapors or formic and sulfuric acid? I was quite into chemistry in school and after, but I do not remember that much, so I feel like I should know this but I cannot recall anymore.
So at room temperature, if you would take a small amount of each of these acids and keep them either separately or mixed together, how fast/how much would evaporate and create dangerous acid vapor?
I might sound like a kill joy but I strongly suggest that you do not attempt to make carbon monoxide. The reaction you describe is a not one for the faint hearted. I would like to point out that aerosols of sulfuric acid are very harmful to the lungs, eyes and the rest of your body.

I think that any work done in the lab with concentrated sulfuric acid should be done in a fume hood to protect you against aerosols of the acid. The fumes from the formic acid are going to be corrosive.

In my youth we used to work on the open bench with glacial acetic acid, this is not a good thing to do as the whole lab soon becomes like a viniger factory. I fear that with formic acid being handled outside the hood the lab will soon become rather unpleasnent.