The Organization for the Prohibition of Chemical Weapons (OPCW) is a global organization, not an organization of the European Union. It may work in coordination with NATO or WHO, but it is not affiliated directly with these bodies. Thus, statement 1 is incorrect.

Secondly, the OPCW does indeed monitor the chemical industry to prevent the emergence of new weapons. It works on a global level to deter and detect the development, production, and use of chemical weapons. Therefore, statement 2 is correct.

Lastly, the OPCW is also tasked with providing assistance and protection to its State Parties against chemical weapons threats. This includes helping countries detect, protect from, and respond to the use of chemical arms. Therefore, statement 3 is truthful.

Hence, option-2 (`2 and 3 only`) is the correct answer. It represents that both the proactive measures and responsiveness of the OPCW against the chemical weapons threats to state parties are correct, while their direct articulation with Europe is not accurate.