When smog floated above America’s big cities, it caused acid rain. It is sulfuric or nitric acid that falls to the ground from the atmosphere in wet or dry forms in rain, snow or fog.

And unlike the compounds that cause acid rain, these pollutants are almost impossible to get rid of. As government regulators focused on reigning in air pollution, companies were busy generating ...

Pollen from the trees around us might be preserved inside. She believes that the Permian extinction was caused by acid rain following a massive release of volcanic gases. She wants to compare tree ...

Make Sunsets, sells “cooling credits," which pay to launch weather balloons made of biodegradable latex containing hydrogen ...

Despite powerful resistance, these allies got the system adopted as national law in 1990, to control the power-plant pollutants that cause acid rain. With the help of federal bureaucrats willing ...

Reduced visibility and haze are primarily caused by soot, which also damages forests and crops by reducing nutrients in soil. Sulfur pollution is primarily released into the air by burning coal. It ...