How Do You Treat Inhaling Chlorine Fumes?

Get away from the fumes IMMEDIATELY.
Get out into FRESH AIR.

If you breathed fumes deep into your lungs, GET TO A HOSPITAL.

If you had a thick cloth over mouth and nose but still breathed in some fumes
     -Get away from the fumes IMMEDIATELY.
     -Get out into FRESH AIR FOR 20 MINUTES.

     -if nose or throat feels sore, CALL A DOCTOR or GET TO A HOSPITAL.

This is NOT a medical opinion.
See a doctor or poison control centre.