A dust cloud over Congonhas in Brazil forced a temporary halt at four iron-ore miners, including Vale and CSN, that cause most of the town's pollution.
Mining
Key Facts
—The order. Congonhas, in Minas Gerais, halted operations at four miners on July 12 after a dust cloud engulfed the town.
—The firms. CSN, Vale, Ferro+ and Gerdau were named; the city says the four account for over 96% of local particulate emissions.
—The cause. Prolonged drought and strong winds lifted iron-ore dust into the air, overwhelming the companies’ control measures.
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