Reuters: American farmers have been ridiculing a proposal by U.S. regulators to reduce the amount of dust floating in rural air. “If there’s ever been rural America, that’s what rural America is,” said Nebraska hog farmer Danny Kluthe. “You know? It’s dirt out here, and with dirt you’ve got dust.” The Environmental Protection Agency is looking to tighten standards for the amount of harmful particles in the air, facing opposition from U.S. farming groups who call it an unrealistic …