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When heavy-loaded conditions are detected (defined by a significant deviation of the optical properties from a 10-year climatology), obtained for aerosol layers above 2500 m, an automatic alert is sent to scientists of the Romanian Lidar Network (ROLINET) to further monitor the event. The Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) back-trajectory calculations are used to establish the possible pollution source. The aerosol transport events are considered to be major when various optical properties provided by the photometer are found outside the climatological values. The aerosol types over the three years for all the events identified revealed that the contribution to the pollution was 31%, 9%, and 60% from marine, dust, and continental types. Considering only the \u2018outside climatology limits\u2019 events, the respective contribution was 15%, 12%, and 73% for marine, dust, and continental types, respectively.<\/jats:p>","DOI":"10.3390\/rs14051217","type":"journal-article","created":{"date-parts":[[2022,3,2]],"date-time":"2022-03-02T22:53:25Z","timestamp":1646261605000},"page":"1217","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Towards Early Detection of Tropospheric Aerosol Layers Using Monitoring with Ceilometer, Photometer, and Air Mass Trajectories"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9237-8320","authenticated-orcid":false,"given":"Mariana","family":"Adam","sequence":"first","affiliation":[{"name":"National Institute of Research and Development for Optoelectronics\u2014INOE 2000, 077125 Magurele, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3009-2407","authenticated-orcid":false,"given":"Konstantinos","family":"Fragkos","sequence":"additional","affiliation":[{"name":"National Institute of Research and Development for Optoelectronics\u2014INOE 2000, 077125 Magurele, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0065-9791","authenticated-orcid":false,"given":"Ioannis","family":"Binietoglou","sequence":"additional","affiliation":[{"name":"Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, GR-15 236 Athens, Greece"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongxiang","family":"Wang","sequence":"additional","affiliation":[{"name":"Faculty of Physics, University of Warsaw, 02-093 Warsaw, Poland"},{"name":"SEPCOIII Electric Power Construction Co., Ltd., Qingdao 266100, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3890-2953","authenticated-orcid":false,"given":"Iwona S.","family":"Stachlewska","sequence":"additional","affiliation":[{"name":"Faculty of Physics, University of Warsaw, 02-093 Warsaw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Livio","family":"Belegante","sequence":"additional","affiliation":[{"name":"National Institute of Research and Development for Optoelectronics\u2014INOE 2000, 077125 Magurele, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victor","family":"Nicolae","sequence":"additional","affiliation":[{"name":"National Institute of Research and Development for Optoelectronics\u2014INOE 2000, 077125 Magurele, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,3,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"53","DOI":"10.1007\/s10546-004-6350-z","article-title":"Atmospheric boundary-layer strcture observed during a haze event due to forest-fire smoke","volume":"114","author":"Pahlow","year":"2005","journal-title":"Bound. 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