Phosphoric Acid can affect you when breathed in.

Phosphoric Acid is a CORROSIVE CHEMICAL and

contact can irritate and burn the eyes.

Breathing Phosphoric Acid can irritate the nose, throat

and lungs causing coughing and wheezing.

Long-term exposure to the liquid may cause drying and

cracking of the skin.

http://nj.gov/health/eoh/rtkweb/documents/fs/1516.pdf