: Increasing levels of air pollution in China, India, and other Asian countries are affecting not only the health of people locally but also the weather globally. According to a study
published in the Proceedings of the National Academy of Sciences
, Yuan Wang of Caltech’s Jet Propulsion Laboratory and colleagues used computer modeling to study the effect of the tiny polluting particles that originate in Asia. They found that those particles can end up being blown over the north Pacific Ocean, where they interact with water droplets in the air and cause clouds to become thicker and taller and precipitation to become heavier. Weather systems there can then spread to other parts of the world. The researchers also found that the effect was most pronounced during the winter.