The CE marking ensures that the emission levels of smart meters comply with applicable standards. Your smart meter uses mobile networks, similar to the communication modules in smartphones.
However, the distance between the meter and your body is much greater (about 10 meters) than between your phone and your head (roughly 10 cm). As a result, exposure to electromagnetic radiation is significantly smaller (about 10,000 times less) than during a phone call. The effect of a communicating meter can be compared to the effect of a neighbor's mobile phone in the apartment next to or above you.
Moreover, the smart meter transmits data for only a few seconds per day, keeping radiation to a minimum.