All 12 moonwalkers had "lunar hay fever" from dust smelling like gunpowder

Apollo astronauts experienced "lunar hay fever" from dust exposure—all 12 moonwalkers suffered respiratory symptoms including sneezing and nasal congestion. An ESA-led international research program is now investigating the toxicity of lunar dust, which contains sharp silicate particles similar to materials that cause lung scarring in Earth-based miners, to assess health risks for future lunar exploration.