Home air quality inspection

Does anyone have a recommendation for a good home air quality inspector? I have a friend renting a unit in an 100+ year old character building downtown who is complaining of consistently getting headaches when at home. Leaving all the windows open and improving air circulation doesn't seem to help much.

I took a look and there are no signs of mold, but in such an old building who knows? The unit has a very modern interior, but has exposed brick walls throughout and wood ceilings, so not if the building frame is the cause.

Any recommendations for air inspectors, and anyone else have issues w/ really old buildings?

I'm also looking for air inspector.

Did you find one?

Try here: http://www.arpis.com/products-servic...lity-solutions

I've used http://calgary.motorioussolutions.com/index.html

Was good and flexible with his times