Picture the causes of air pollution in a major city and you are likely to visualise pollutants spewing out of cars, trucks and buses.
원문출처 : https://www.cnn.com/2018/02/20/health/vocs-clean-air-partner/index.html
원문출처 : https://www.cnn.com/2018/02/20/health/vocs-clean-air-partner/index.html