Measurement and analysis of extremely low frequency magnetic field exposure in Swedish residence

The measurements were performed to understand the personal exposure of magnetic field (MF) at extremely low frequency in residents of Göteborg, Borås and Mark. The challenge was to perform measurement in 100 houses. And the houses were randomly selected to be in urban area and country side. The measurement of MF was made using three instruments. The results conclude that almost 90 % of the measured houses have exposure of MF below 0.2µT with mean value of BAdjust 0.11µT and median value 0.05 µT. This signifies that most of the houses are not exposed to high magnetic field. The comparison of MF exposure in three different areas (Göteborg, Borås and Others) shows that in other areas 97 % houses have MF exposure below 0.2 µT with median value 0.04 µT, and around 85 % of houses have 0.2 µT in rest of the regions. Magnetic field was found to be highest on the floor level in most of the houses as compare to middle and top level. About 36 % of the houses have MF highest on floor level. Reason for this is underground heating systems and electric wiring in houses. The analysis among villas and apartment on the bases of adjusted average BAdjust MF value shows that exposure of MF in 83% of the houses among apartment are below 0.2 µT and 89 % of the houses among the villas are