You don't have to be a scientist to solve big environmental problems. One Dutch designer is finding creative ways to make a change-and he's inviting bikers to join him. Daan Roosgaarde, 38, is a designer from Holland. He uses creative ideas to improve city life. For his Smog( 雾霾) Free Project, he designed a special tower that cleans air in Chinese parks . In Holland , he designed a shining bicycle path . Now Daan and his team are working with engineers at Chinese bike-sharing company Ofo to create a new product for public use. It's an air-cleaning machine connected to a bicycle and is part of the Smog Free Project. In smoggy weather, the machine would breathe in the air in front of the bike and blow out a stream of clean air toward the biker’s face. It's no secret that air pollution is a big problem for China. In winter, it's common for thick clouds of haze( 霾) , caused largely by factory production, burning of coal and car emissions( 排放物) ,to cover areas of China. In 2016, only one-fourth of Chinese cities met the country's air quality standards according to a survey of 338 cities nationwide from the Ministry of Environmental Protection. "Of course one tower and a few bikes won't solve China's air pollution problem,"Daan said. "But smog-free bikes are an exciting idea that will hopefully inspire communities to create greener cities." According to the writer, ______________.