Sulfuric Acid Inhalation Exposure?

At such a low concentration, the acid should do relatively little harm initially, but long-term exposure is very dangerous. Sulfuric acid is very destructive to mucous membranes and the upper respiratory tract. Find and print an MSDS for sulfuric acid, and read it thoroughly if you're not sure. They can be found at the sigma-aldrich website, or various sites online.