Atmospheric Ammonia Concentrations (image) Institute of Atmospheric Physics, Chinese Academy of Sciences Share Print E-Mail Caption Contributions of emissions from various source sectors to the atmospheric ammonia concentrations in urban Beijing. This figure shows the results based on year-round isotopic measurements. However, under conditions with polluted southerly flow, 73 percent (35-95 percent) of the initial ammonia could be attributed to fossil fuel emissions. Credit Yuepeng Pan Usage Restrictions None Share Print E-Mail 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.