http://birminghamnewsroom.com/no-congestion-charge-in-birmingham/ [4]
https://www.gov.uk/government/news/improving-air-quality-in-cities [5]
http://birminghamnewsroom.com/research-work-starts-on-clean-air-zone/ [6]
Links
[1] http://www.si.re.kr/%23
[2] http://facebook.com/sharer.php?u=http%3A%2F%2Fwww.si.re.kr%2Fnode%2F54019&t=%E2%80%98%EA%B3%B5%EA%B8%B0%EC%B2%AD%EC%A0%95%EC%A7%80%EC%97%AD%E2%80%99%20%EB%8F%84%EC%9E%85%ED%95%B4%20%EB%8C%80%EA%B8%B0%EC%98%A4%EC%97%BC%20%EA%B0%9C%EC%84%A0%20%EC%B6%94%EC%A7%84%20%28%EC%98%81%EA%B5%AD%20%EB%B2%84%EB%B0%8D%EC%97%84%E5%B8%82%29
[3] http://twitter.com/intent/tweet?url=http%3A%2F%2Fwww.si.re.kr%2Fnode%2F54019&text=%E2%80%98%EA%B3%B5%EA%B8%B0%EC%B2%AD%EC%A0%95%EC%A7%80%EC%97%AD%E2%80%99%20%EB%8F%84%EC%9E%85%ED%95%B4%20%EB%8C%80%EA%B8%B0%EC%98%A4%EC%97%BC%20%EA%B0%9C%EC%84%A0%20%EC%B6%94%EC%A7%84%20%28%EC%98%81%EA%B5%AD%20%EB%B2%84%EB%B0%8D%EC%97%84%E5%B8%82%29
[4] http://birminghamnewsroom.com/no-congestion-charge-in-birmingham/
[5] https://www.gov.uk/government/news/improving-air-quality-in-cities
[6] http://birminghamnewsroom.com/research-work-starts-on-clean-air-zone/
[7] http://www.si.re.kr/world_trends