Air quality models were used to show that reducing emissions has significant health benefits. By analyzing how pollutants move in the atmosphere, researchers found that emission controls vary in effectiveness depending on the type of pollutant and the state of the atmosphere. As the air gets cleaner, the benefits of emission control increase, especially for pollutants like ozone. The study suggests that current emission control efforts will pay off in the future, with benefits compounding over time. This research highlights the importance of ongoing efforts to reduce emissions for long-term public health benefits.