The FCC , on?May 3, 2021, enacted rules governing RF exposure and allowed a 2-year transition period for all RF emitting stations to comply. On?May 23, 2023?ALL transmitters operating in the United States must comply with the rules. There is an excellent article about this in the May issue of QST. In a nutshell, all stations must complete an RF exposure survey and maintain documentation of that survey for every transmitter and antenna they utilize. To help amateur radio operators comply with this, the ARRL has developed an on-line exposure calculator to do the calculations and print out the results for documentation.
calculator
ARRL article
Youtube video
Eric Presser - KD?CEN