Eating hailstones collected directly from the ground or during a storm is strongly discouraged because atmospheric ice acts as a natural sponge for airborne pollutants. As hailstones form and fall through a turbulent thundercloud, they trap vehicle exhaust particles, heavy metals, industrial chemical emissions, pesticides, pollen, bird droppings, and harmful bacteria present in the atmosphere. Furthermore, ice collected off roofs, driveways, or lawns can pick up toxic street grime, making it unsafe for human consumption.
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