FCC Compliance Assessments/Surveys are required of the telecommunication providers to ensure their antenna/base station sites do not pose a health risk and are within FCC guidelines based upon OET bulletin 65.  The FCC guidelines for MPE (Maximum Permissible Exposure) for general population uncontrolled environment is based upon a  (30-minute Time Averaging) and for Occupational controlled environment is based upon a (6-minute Time Averaging). OSHA also recognizes these limits as state-of-the-art scientific consensus standards.  If these limits are exceeded AES will help set up a RF safety plan: 

Updated Radio Frequency Exposure Rules Become Effective on May 3– Updated Radio Frequency Exposure Rules Become Effective on May 3 (arrl.org)