InsideClimate: For more than a month, residents of Mayflower, Ark. have been told not to worry about lingering fumes from a March 29 oil spill that shut down a neighborhood and forced the evacuation of 22 homes. "Overall, air emissions in the community continue to be below levels likely to cause health effects for the general population," Arkansas regulators wrote on a state-operated website [3] that tracks Mayflower's air monitoring data. Despite these reassurances, residents have suffered headaches, nausea...