Ball and PAH (image) DOE/Pacific Northwest National Laboratory Caption When airborne particles (green) form before pollutants known as PAHs (yellow) glob on, both the pollutants and particles dissipate quickly, as shown in the top row. But when the particles form in the presence of pollutants, which is what likely happens in nature, the long-lasting particles can take the pollutants for a long-distance ride (bottom). Credit Zelenyuk/PNNL Usage Restrictions Credit Zelenyuk/PNNL Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.