"It was true during the first 30 years of China's opening-up while China was attracting foreign investment, pollution was an issue," he said

According to Allen Williams, the business development manager at the Iowa Economic Development Authority, the state has had more inquiries from China in recent months than in the previous two or three years

Travelers had to change flights in Shanghai or Nanjing, Jiangsu province

Children cool off themselves at a wading pool in Toronto, Canada, on Sept 24, 2017

The university was the first in the province to have such a course