Global rainfall is increasingly contaminated with trifluoroacetic acid (TFA), a persistent chemical raising concerns among scientists and regulators. TFA, an ultra-short-chain PFAS, originates from industrial discharges, fluorinated gas breakdown, and PFAS compound decomposition. Its accumulation in rain, water sources, and food crops poses potential risks to human health and aquatic ecosystems, prompting calls for urgent action to curb its spread.