Every day, you need to make sure to get 4,200 mg of potassium for digestion, to maintain healthy blood pressure, to carry out muscle contractions, and also for proper nerve, kidney, and heart functions.
Over the next decade, the legislation was once again amended to extend these deadlines and to mandate states to revise their implementation plans. Congress did not amend the Clean Air Act during the decade of the 1980s, in part because President Reagan's administration placed economic goals ahead of environmental goals.
In 1990, Congress again strengthened the motor vehicle program. The 1990 Clean Air Act Amendments established tighter standards for automobiles, trucks, and buses, called for the control of nonroad engines, strengthened EPA's in-use compliance, and established requirements for both conventional and alternative fuels.he 1990 Clean Air Act Amendments established tighter standards for automobiles, trucks, and buses, called for the control of nonroad engines, strengthened EPA's in-use compliance, and established requirements for both conventional and alternative fuels.