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. The atmospheric boundary layer height (BLH) is a keyparameter in weather forecasting and air quality prediction. To investigate therelationship between BLH and air pollution under different conditions, acompact micro-pulse lidar integrating both direct-detection lidar (DDL) andcoherent Doppler wind lidar (CDWL) has been built. This hybrid lidar is operatedat 1.5  µm , which is eye-safe and made of all-fibre components. TheBLH can be determined from aerosol density and vertical wind independently.During a 45  h continuous observation in June 2018, the stable boundary layer,residual layer and convective boundary layer are identified. The fine structureof the aerosol layers, drizzles and vertical wind near the cloud base are alsodetected. In comparison, the standard deviation between BLH values derivedfrom DDL and CDWL is 0.06  km , indicating the accuracy of this work. Theretrieved convective BLH is a little higher than that from ERA5 reanalysisdue to different retrieval methods. Correlation between different BLH andPM 2.5 is strongly negative before a precipitation event and becomesmuch weaker after the precipitation. Different relationships between PM 2.5 and BLH may result from different BLH retrieval methods, pollutant sourcesand meteorological conditions.

Relationship analysis of PM&lt;sub&gt;2.5&lt;/sub&gt; and boundary layer height using an aerosol and turbulence detection lidar

Relationship analysis of PM<sub>2.5</sub> and boundary layer height using an aerosol and turbulence detection lidar