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Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) measurements of 19 chemical elements in Mongolian oak tree rings from Harbin, China. The dataset provides a 5-year resolution proxy for element signals from 1965 to 2020, created by ENVIDAT and hosted on NASA EarthData. Its primary purpose is to reconstruct historical air pollution trends in a major industrial city prior to the establishment of formal air quality monitoring.
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