A study released by the Pew Research Center found corruption and pollution chief among Chinese citizens’ concerns, The Wall Street Journal reported. The survey, based on 3,649 face-to-face interviews with adults aged 18 and up, was conducted in May, shortly before the mainland’s stock market tanked. 84% of respondents viewed official corruption as a big problem – with 44% calling it a very big problem. Air and water pollution were considered big problems by 76% and 75% of respondents, respectively. But China’s wealth gap and crime weren’t far behind, at 75% and 74%, respectively.