Almost 200 pesticides have been found by a study examining dust in homes around Europe, as scientists say regulators need to take “toxic cocktails” of chemicals into account when banning or restricting the use of pesticides. Scientists say their research supports the idea that regulators should assess the risks posed by pesticides when they react with other chemicals, as well as individually. They say this should apply to substances already in use, as well as those yet to be approved. In preliminary findings from the largest study of its kind, scientists examining household dust from homes in 10 European countries