Of everything that builds up in a UAE air-conditioning system, mould is the one that worries people most, and with good reason. The country’s coastal humidity and near-constant cooling create near-perfect conditions for it, deep inside ducts you cannot see. At Mega Meter, it is one of the most common things we find after a long, humid summer. This guide explains why mould forms in AC ducts, the health risks it carries, and how it is properly removed.