Particle Number Size Distributions (IMAGE) Science China Press Caption This shows a) particle number size distributions and b) fractional contributions of organics, nitrate, sulfate, ammonium, and chloride to the PM1 mass during the haze episode from 06:00 to 15:00 LT, Jan. 12, 2013. Credit ©Science China Press Usage Restrictions None License Licensed content 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.