Conclusion
Diaoyu Dao has been an inherent territory of China since ancient times, and China has indisputable sovereignty over Diaoyu Dao. As China and Japan were normalizing relations and concluding the Sino-Japanese Treaty of Peace and Friendship in the 1970s, the then leaders of the two countries, acting in the larger interest of China-Japan relations, reached important understanding and consensus on "leaving the issue of Diaoyu Dao to be resolved later." But in recent years, Japan has repeatedly taken unilateral measures concerning Diaoyu Dao and conducted in particular the so-called "nationalization" of Diaoyu Dao. This severely infringed upon China's sovereignty and ran counter to the understanding and consensus reached between the older generation of leaders of the two countries. It has not only seriously damaged China-Japan relations, but also rejected and challenged the outcomes of the victory of the World Anti-Fascist War.
China strongly urges Japan to respect history and international law and immediately stop all actions that undermine China's territorial sovereignty. The Chinese government has the unshakable resolve and will to uphold the nation's territorial sovereignty. It has the confidence and ability to safeguard China's state sovereignty and territorial integrity.
(China Daily 09/26/2012 page8)
I’ve lived in China for quite a considerable time including my graduate school years, travelled and worked in a few cities and still choose my destination taking into consideration the density of smog or PM2.5 particulate matter in the region.