A recent study published in the journal Environmental Science & Technology claims that drinking rainwater is dangerous because of the presence of the "forever chemicals" in it.

Per- and polyfluoroalkyl substances, sometimes known as PFAS, are man-made compounds used in many industries, including food packaging and waterproof clothing. Researchers have discovered significant environmental contamination with PFAS. Because they can persist for a very long time, PFAS are referred to as "forever chemicals." These chemicals pollute the environment globally and have been detected in soil, rainwater, snow, and even human blood. PFAS contamination has resulted in increased incidences of several diseases like cancer, infertility, pregnancy complications, challenges with childrens learning and behaviour, immune system abnormalities, and elevated cholesterol.

In this study, the levels of four different perfluoroalkyl acids, including perfluorohexanesulfonic acid (PFHxS), perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), and perfluorononanoic acid (PFNA), in various sources, such as rainwater, surface water, and soil, were compared to global guidelines. The researchers found that the amounts of PFOA and PFOS in rainwater frequently "greatly exceed" European and American drinking water standards. PFAS now cycle naturally, frequently moving from seawater to marine air via sea spray particles.

The research team emphasized the need of taking quick action to stop additional harm and contamination, which would necessitate "a significant investment in advanced cleanup technology" and "rapidly prohibiting uses of PFAS wherever practicable." (Medscape, August 16, 2022)