SMHI is an abbreviation for Sveriges Meteorologiska och Hydrologiska Institut, (Sweden's Meteorological and Hydrological Institute). SMHI is a government agency in Sweden and operates under the Ministry of Sustainable Development.  SMHI has expertise within the areas of meteorology, hydrology and oceanography, and has extensive service and business operations within these areas.
SMHI's head office is located in Norrköping. Prior to 1975 it was located in Stockholm but after a decision taken in the Riksdag in 1971 it was relocated to Norrköping in 1975. SMHI also has offices in Stockholm, Göteborg, Malmö and Sundsvall. To the Swedish public SMHI is mostly known for the weather forecasts in the public-service radio provided by Sveriges Radio. Many of the other major media companies in Sweden also buy weather forecasts from SMHI.
Staff and organisation 
- Meteorological prediction and analysis
- Air quality
- Regional climate modelling (at the Rossby Centre)
- Remote sensing and radiation
The regional climate modelling is at the Rossby Centre, which was established at SMHI in 1997. 
Environmental research spans all six research units. There is also a project for providing contributions to the HIRLAM (High Resolution Limited Area Model) project.
The main goal of the research division is to support the Institute with research and development as well as to participate in many national and international research projects.
Air quality research 
Some of the atmospheric pollution dispersion models developed by the air quality research unit are:
- the DISPERSION21 model (also called DISPERSION 2.1) 
- the AirViro Air Quality Management system 
- the MATCH model 
See also 
- Air pollution dispersion terminology
- List of atmospheric dispersion models
- National Environmental Research Institute of Denmark
- North West Shelf Operational Oceanographic System
- Royal Meteorological Society
- SMHI web site (in English)
- The Model Documententation System (MDS) of the European Topic Centre on Air and Climate Change (part of the European Environment Agency)
- AirViro page on Westlakes web site