Several decades ago, precipitation in Delaware was among the most acidic in the country.

Daily weather forecast and wrap-up provided by RedOrbit meteorologist Joshua Kelly.

Daily weather forecast and wrap-up provided by RedOrbit meteorologist Joshua Kelly.

Increases in air pollution and other particulate matter in the atmosphere can strongly affect cloud development in ways that reduce precipitation in cool and relatively dry regions, such as Israel in winter, but also can increase rain and the intensity of severe storms in warm and moist regions or seasons, such as the eastern half of the US during summer.

FREMONT, Calif., Sept.