Foshan is a famous homeland of overseas Chinese, with more than 1.3 million living overseas, including more than 0.6 million living in Hong Kong and Macao. Foshan is an old town dated back to many centuries. It was famous for its porcelain industry. Now it has been made the 'third largest city in Guangdong'. The city is relatively affluent when compared to other Chinese cities, and it is home to many large private enterprises. Foshan has recently has seen a transformation brought by China's booming economy. However the air quality in Foshan is atrocious as a result of years of unregulated industrial development.