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Long-term characteristics of criteria air pollutants in megacities of Harbin-Changchun megalopolis, Northeast China: Spatiotemporal variations, source analysis, and meteorological effects

MeteorologyEnvironmental MonitoringEngineeringAtmospheric ScienceNortheast ChinaHarbin-changchun MegalopolisGeographyAir QualityUrban Air QualitySource ApportionmentAir PollutionCriteria Air PollutantsParticulate MatterEarth Science