Billions upon billions of soot particles enter Earth's atmosphere each second, totaling about 5.8 million metric tons a year—posing a climate-warming impact previously estimated at almost one-third ...

Add Yahoo as a preferred source to see more of our stories on Google. Ever wonder why the sky is blue on a clear day, but red when there are pollutants such as smoke in the air? Wildfire smoke fills ...

For decades, scientists have known that soot particles play a pivotal role in forming contrails. When the atmospheric ...