Is poor air quality in Zagreb the result of poison being sprayed from airplanes? No, that's not true: According to the Andrija Štampar Institute of Public Health, it is common to experience reduced air quality during winter months due to an increase in the concentration of floating particles in the air. Spraying plumes of poison from airplanes, creating so-called chemtrails,…

Did Croatia Airlines install a system for releasing chemtrails from its planes without the knowledge of the public? No, that's not true: The 2015 article on which the claim is based is satirical, with a disclaimer at the end. Croatia Airlines denied the claim in a written statement in 2020. The claim appeared in a video (archived here) on TikTok…

Did Reuters news agency report that Poland, Sweden and Norway filed a lawsuit against the World Health Organization for infecting Europe with a chemical sprayed from airplanes that causes pneumonia? No, that's not true: The recycled claim involving the WHO, so-called chemtrails and the three European countries has been previously debunked by Reuters. A far wider conspiracy involving so-called chemtrails…

Are "chemtrails" spreading whooping cough in Croatia? No, that's not true: Croatia is facing a whooping cough epidemic due to falling vaccination rates that one health official says is due to online misinformation. Also, chemtrails don't exist, experts say. The claim originated in a video (archived here) on TikTok on November 19, 2023, with the title (translated from Croatian to…