He found that between these years the carbon dioxide in the atmosphere went up from around 315 parts to around 370 parts per million.这里怎么理解二氧化碳在大气中的含量

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He found that between these years the carbon dioxide in the atmosphere went up from around 315 parts to around 370 parts per million.这里怎么理解二氧化碳在大气中的含量

他发现,在这些年之间,大气中的二氧化碳的含量从大约局部315每百万上升到局部370每百万.