Pesticides banned years ago in the European Union are drifting through the skies and turning up in clouds above France, raising concerns about how long these toxins persist and how far they can travel, with potentially harmful global health impacts, according to a pathbreaking new study. The research ... is the first to detect dozens of agricultural chemicals"including insecticides, herbicides, fungicides, and other substances"suspended in cloud water droplets. That means pesticides not only linger in the environment but also move through the atmosphere and fall back to Earth in rain or snow, sometimes at levels exceeding European safe drinking water limits. The study found that clouds can carry current-use pesticides, long-banned compounds, and "emerging contaminants""industrial chemicals that either build up in the environment or form when older pesticides break down. Some even transform into new compounds in the atmosphere itself, beyond what regulators have known to consider. Researchers estimate that French skies alone may contain anywhere from a few tons to more than 100 tons of pesticides at any given time"most carried in from distant sources. Out of 446 possible chemicals screened"including pesticides, biocides (compounds that kill harmful organisms), additives, and transformation products (breakdown products of pesticides)"researchers found 32 different compounds in cloud water.