1) humidity sensing/generation, primary H2O standards, breath alcohol + grain humidity 2) metrology in molecular spectroscopy: tracebility of spectral reference data, optical transfer standards for gas analysis, developement and application of TDLAS, CRDS, PAS, OFCEAS, FTIR 3) Aerosol metrology: reference aerosol generation (soot, Ag, NaCl, PSL ..), aerosol diagnostics, traceability of particle number concentration, aerosol mass fraction, opacity etc ; traceable calibration of aerosol instrumentation e.g. electrometers, CPC, EECPC, SMPS etc4) Traffic emmissions: vehicle emission inspection (soot, CO, NOx, ... ), type approval for PTI instrumentation for gases and aerosols , metrological support for emission measurment instrumentation vehicle type approval important EMPIR project consortia EUMETRISPEC : see http://www.eumetrispec.org/emrp/eumetrispec.html 2011-2014 (coordinator)METROPEMS: see https://www.metropems.ptb.de/home/ 2019 - 2023MetRoViTemp (Metrology for broadband-ro-vibrational spectroscopic gas thermometry) project application as coordinator: https://msu.euramet.org/current_calls/fundamental_2020/documents/SRT-f17.pdf

the German Ministry of traffic ( BMVi) decided in 2017 to introduce soot particle number measurements in the German vehicle PTI scheme (AU) under the German Weights and Measures Act (MessEV)AUPNag: is the German federation commitee on the introduction of PN-PTI-devices (AUPN). The Commitee is comprised of ASA, VDA, VDiK, VdTUEV, DEKRA, TUEV, ZDK, BMWi, PTB, BMVi, BASt, and the German verification authorities, and lead by BASt (U. Ellmers) and PTB (V. Ebert)

OIML TC 16/SC 1: Air pollution is responsible for R 99:2008 Instruments for measuring vehicle exhaust emissions R 143:2009 Instruments for the continuous measurement of SO2 in stationary source emissions R 144:2013 Instruments for the continuous measurement of CO and NOx in stationary source emissions https://www.oiml.org/en/technical-work/tc-sc/scinfo_view?idsc=35&sclabel=Air%20pollution&idtc=16&tcnum=16&scnum=1&tclabel=Instruments%20for%20measuring%20pollutantsBackground: OIML: International Organization of Legal MetrologyTC 16 : Technical committee on „Instruments for measuring pollutants“, SC 1: Sub committee on „Air Pollution“OIML is an intergovernmental treaty organization which---develops model regulations, standards and related documents for use by legal metrology authorities and industry,---provides mutual recognition systems which reduce trade barriers and costs in a global market,---represents the interests of the legal metrology community within international organizations and forums concerned with metrology, standardization, testing, certification and accreditation,---promotes and facilitates the exchange of knowledge and competencies within the legal metrology community worldwide,---cooperates with other metrology bodies to raise awareness of the contribution that a sound legal metrology infrastructure can make to a modern economy.

participating in WG 25 Biomethane

participating member of DIN Standards Committee Road Vehicle Engineeringstandardization activity NA 052-00-34-53Road Vehicles - Portable Emission Measuring Systems (PEMS) - Performance Assessment