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Concurrent measurements of atmospheric ammonia concentrations in the megacities of Beijing and Shanghai by using cavity ring-down spectroscopy

Environmental MonitoringConcurrent MeasurementsEngineeringAir Pollution MeasurementAtmospheric ScienceSpectroscopyAtmospheric Ammonia ConcentrationsAir QualityCavity Ring-down SpectroscopyAtmospheric ProcessAmmoniaAir PollutionEarth ScienceChemical Emission