美国国家公园内的臭氧浓度与美国最大城市中的臭氧浓度相似 (IMAGE)

American Association for the Advancement of Science (AAAS)

美国国家公园内的臭氧浓度与美国最大城市中的臭氧浓度相似

Caption

在布莱斯峡谷国家公园中晴朗的一天。

Credit

Alex Hollingsworth

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