Many of the Chinese citizens started to wonder if air pollution is the cause of the increase of lung cancer. This question began to rise because the citizens in China must constantly wear face masks to avoid breathing in the hazardous particles from their polluted skies. Some experts agree that it is the reason, but others say there isn't enough evidence. Wang Ning, deputy director of the Beijing Office for Prevention and Control, says he has seen a rise in a certain cancer called adenicarcinoma, which is a mucus that is seen as a side effect from pollution. China's lung cancer rate is 32% of the entire world's lung cancer patients. Meanwhile, as lung cancer increases, gastric, esophageal, and cervical cancer have all decreased in China.