California issues warning re cell phone emissions

I just saw this warning from California. Will enabling “airplane mode” remedy the issue regarding keeping your phone close at night? Is there a way to turn off the cellular radio automatically with “nighttime mode” or “do not disturb” mode?

CalIfornia Department Of Public Health Issues Guidelines on How to Reduce Exposure to Radio Frequency Energy from Cell Phones

https://www.cdph.ca.gov/Programs/OPA/Pages/NR17-086.aspx