I'm in the the process of moving out to a house where i have my shop.

The shop was built by the previous owner. Its like a 20 by 20 deal. Very high roof, no door, just a opening area to pull the car in. Concrete is very powdery on the surface. Lots of dust when you walk, enough for it cover my black sneakers with a white dust. I worked in there for two straight weekends, all day on Saturday. Developed a sinus infection from it I believe.

What do you guys do to keep fresh air coming and going out of the shop?

I have a enclosed room off to the side that is very stale and dusty from the concrete floor.

Sounds like alot of lime in the concrete mix. Might good to look into sealing the floor.
Is it concrete or crushed lime stone well packed.

Bought one of these to use on my small garage (16x20 ish):
http://www.lowes.com/lowes/lkn?action=productDetail&productId=85893-228-APG
This to make it pretty from the outside:
http://www.lowes.com/lowes/lkn?action=productDetail&productId=31007-328-SHT15W&lpage=none
Still need to wire it in so not 100% sure of the flow. Its up on the high corner oposite the garage door.

Grainger sells some real nice fans with motorized shutters. To high on the cost for my budget.

Its concrete. A very bad batch I would say. I'm going to have a concrete guy come over and look at it.

if its possible setup a flow thru type system .... big fan or fans on opposite side from door opening ... problem is you need window or sky light opening to make it work ...... on the floor problem I'm sure the cement guy can recommend some kind of sealer :)

Pick up a 3/4 respirator from HD, and use the P95 filters with it, and you're good to go.

I fixed a garage floor that was like that 20 years ago. I called around to floor people until somebody hooked me up with a "self leveling concrete floor repair". I don't remember the name but it came with a 5 gallon bucket and a drill with a mixing paddle attached. You pour a bag in the bucket, add the right amount of water, mix it up and pour it out on the floor. Something like 8 bucket loads total. You have to have a level pad and dam up the door jams with some trim wood. You go for around 1/4" thickness and let it set up over night. The stuff was amazing!!! It looks just like a new slab was pured perfectly! It is also used in factories to build up worn out floors and front of mills and on concrete stairways. I installed a peel and stick black and white checker board vinyl tile right on it without any sanding or leveling. Cost around $400.00 20 years ago

I fixed a garage floor that was like that 20 years ago. I called around to floor people until somebody hooked me up with a "self leveling concrete floor repair". I don't remember the name but it came with a 5 gallon bucket and a drill with a mixing paddle attached. You pour a bag in the bucket, add the right amount of water, mix it up and pour it out on the floor. Something like 8 bucket loads total. You have to have a level pad and dam up the door jams with some trim wood. You go for around 1/4" thickness and let it set up over night. The stuff was amazing!!! It looks just like a new slab was pured perfectly! It is also used in factories to build up worn out floors and front of mills and on concrete stairways. I installed a peel and stick black and white checker board vinyl tile right on it without any sanding or leveling. Cost around $400.00 20 years ago

Sounds too good to be available these days. I need some.

What about pressure washing the floor? I have a cheapo Pressure washer from Harbor Fright that isn't so powerful that it knocks the rocks out of the concrete. I think it was 99.00 or so.

Maybe vacuum it with the shop vac really well?

K

Clean prep and resurface will do wonders for the concrete. But wasn't the question air quality? For that a air exchanger would be the best just expensive. Plus side is fumes from gas or solvents would be removed eliminating dangers in the shop.

What is a air exchanger?

A unit installed in new homes that exchange the stale air with fresh air. It has a manifold to prewarm the air in winter. Also is used to reduce moisture in the house from new building codes.

Why not just paint the floor? They sell concrete paint at Lowes and Home Depot. Let it cure right, and it'll last a long time, car tires and all. You'd need to prep it good, probably a stiff bristle brush and a leaf blower would do the trick.