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Elderly Mexicans used in smog-detecting experiment

smog

In a study to determine the effect of Mexico City's air on people over 65, 32 elderly residents will wear 5-pound jackets outfitted with monitors for six different kinds of pollution and that will also keep track of their heart rate. They'll wear them in 24-hour stints, every other day, for three months. Remember that this is a city where the air is so dirty that street vendors sell oxygen.