1 Pitchers must throw a pitch within 20 seconds of receiving the ball. 2  Clocks posted in each dugout will count down the 20 seconds. 3  There will be a maximum break between innings of 2:05, with a clock keeping track. 4  Hitters must be in the batter's box by 1:45. 5  If the hitter's not ready, the umpire can call a strike. If the pitcher doesn't throw a pitch by 2:05, the umpire can call a ball. 2  Teams will have a maximum of 2:30 to change pitchers, with the clock starting as soon as the reliever enters the playing field. 3  Teams are limited to a maximum of three mound visits per game, not including pitching changes.
The Clean Air Act, originally passed in 1973 and amended in 1990, is a United States federal law designed to protect human health and the environment from the effects of air pollution.
The Air Pollution Control Act of 1955 (Pub.L. 84â159, ch. 360, 69 Stat. 322) was the first Clean Air Act (United States) enacted by Congress to address the national environmental problem of air pollution on July 14, 1955. This was an act to provide research and technical assistance relating to air pollution control.he first National Air Pollution Symposium in the United States was held in 1949 and hosted by Stanford Research Institute (now SRI International). At first, smaller governments were responsible for the passage and enforcement of such legislation.