Array stores timezone schedule. Configuration for menus. People track pesticide residues into their homes on the soles of shoes, where they fail to break down in the absence of sunlight, water and bacteria, and can persist in carpet dust for a year after the lawn outside was treated. This poses a particular danger to children who spend more time at ground level and are already more sensitive to chemicals because they eat, drink and breathe more, relative to their body weights, than adults. Well, that's a grey area.
Safety is measured in terms of how much a person is exposed to per kilogram of body weight.
But the chemicals in lawn pesticides are also used in agriculture and household pest control. That means levels of exposure can vary from person to person depending on what they eat and whether they treat their homes and gardens. What's considered safe changes too. For example, the U.S. Environmental Protection Agency recently re-evaluated chlorpyrifos and diazinon, two popular insecticides, and found they existed at unacceptable levels in the environment according to modern standards. As a result, both the EPA and Health Canada's Pesticide Management Regulatory Agency have negotiated a voluntary phase-out of these products over the next few years.