Smog in Beijing (image) Princeton University, Engineering School Share Print E-Mail Caption Researchers found that emissions from residential cooking and heating fires contributes more to smog in the Beijing region than do the transportation sector and power plants combined. Credit Photo Illustration by Gwyneth Olson Usage Restrictions For non-commercial use. 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.