The answer to this question lies within the manufacturing of the products. Companies should have on hand the specifications of their products relative to pollutants and VOC's. If they don't or won't share that data with you, look to other manufacturers.
Some shade manufacturers have double cell (2 layered) fabric products that offer very good solar control. Look for "honeycomb" style shades that come in various levels of light transmittance from shear to black out.
I hope that helps,
Jeff Jeannette Architect, CGBP