The course consists of sub-blocks, each of which has a focus topic within aerosol technology, and corresponds to one week of work (i.e. 1.5 credit). The focus topic for the specific sub-blocks will vary over time and depend on what measurement and analysis methodologies that are important for the current PhD student education. Examples can be: aerosol mass spectrometry (AMS); optical particle counters; filter collection; collection of biological particles; gas analysis; OC/EC (organic vs elemental carbon). For each sub-block, the following shall be met: 1. The PhD student shall participate in a preparation lecture about the focus topic and do laboratory preparation exercises. 2. The PhD student participates actively in the laboration(s) and the analysis of the data material. The PhD student writes a laboratory report that is to be approved by the examiner. 3. The PhD student discusses the laboratory exercise and the focus topic in the group together with the course examiner. When all steps are performed for one sub-block, the student receives 1.5 credit.