The SWETHRO Network (Krondroppsnätet) includes measurements of air concentrations and bulk deposition in open areas, as well as throughfall deposition and soil water chemistry inside forest stands.
Measurements within SWETHRO started in the south of Sweden 1985. The purpose is to describe effects of acid deposition in forests, i.e. current state, regional differences and changes with time. Some of the original sites, from 1985, are still operating, resulting in time series of more than 30 years.
The SWETHRO network is financed by regional air quality protection associations and local county administrative boards. They decide what to measure and when, in collaboration with the SWETHRO scientists. As a result, the measurements at different monitoring sites cover different time periods.