Shanghai in October 2019 (IMAGE) University of Washington Caption This image of Shanghai in October 2019 shows that although China's air quality is improving, cities can experience high levels of pollution. The combination of high average pollution and strict lockdown policy made a good test for how pandemic-related changes affected air quality. Credit Arend Kuester/Flickr Usage Restrictions With credit 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.