Source contributions (%) to ammonia emissions in China (IMAGE) Science China Press Caption (a) 2014; (b)2016; (c)2018. Credit ©Science China Press Usage Restrictions Use with credit. License Original 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.