Beijing Smog Comparison (IMAGE) Northwestern University Caption Heavy air pollution has resulted in widespread smog. These photographs, taken in August 2005, show the variations in Beijing's air quality. Credit Bobak Ha'Eri 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.