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Unmanned aerial vehicles weighing more than 250 grams will have to go through a registration process, according to the civil drone registration system instituted by the Civil Aviation Administration of China (CAAC).

The system officially began operation on May 18, and it will come into force on June 1. CAAC also announced protective zones around 155 airports, so as to prevent flights from being affected by drones.

Unmanned aerial vehicles have caused flight interferences at multiple airports in the past. On May 12, flights leaving southwestern China’s Chongqing Municipality were disrupted when several unregistered drones suddenly appeared on airstrips, affecting over 100 planes.

Experts warned that drones can cause injuries when they fall from the sky, and unregulated drones can cause private information to be leaked. They therefore suggest an integrated rule to regulate the production and operation of drones.

Domestic demand for drones is growing by 50 percent annually, set to yield a total market value of 75 billion RMB ($11 billion) by 2025.