This is three times higher the rate than previously thought.
The research shows that around 1,000 Finns die as a result of fine particle emissions annually.
Emissions from diesel engines and industrial sources are the most visible.
However, the burning of wood is a large contributor to pollution caused by fine particles. Finland's leading expert on fine particle emissions Professor Matti Jantunen of the National Public Health Institute told YLE TV News more data was needed on the harmful effects of wood burning.
The EU Commission plans to issue new proposals in May aimed at cutting air pollution.