In one state, west county and east county share a border. the state capital is in east county. many residents of west county (almost half of all adults in the county) commute to east county for work. east county has high levels of air pollution, and residents there must get their car exhaust systems tested every two years. although west county has less air pollution than east, the pollution levels in west are rising. the state department of environmental regulation orders that residents of west county must now get their car exhaust systems tested every two years as well. what moral standard best explains this decision by the department of environmental regulation?