What standards are applied to ensure correct operation of these antennae by mobile phone operators?

In the year 2000, the parliament of Malta decided that we should adopt the ICNIRP guidelines, which are the standards being used by many countries in Europe and around the world. You can read more about these guidelines and what is ICNIRP by clicking here: http://www.mca.org.mt/article/icnirp-guidelines-full-unabridged-text