SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
School children wearing facemasks against pollution. The school is in Most in the Czech Republic. The masks are needed as the region is frequently enveloped in low-level smoke haze from nearby factories and power stations. The masks were originally provided by a local chemical plant, but lack of funds has prevented their replacement. The incidence of respiratory illness is very high in the local population.
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