We continuously monitor the air quality at 11 monitoring sites around the Helsinki metropolitan area. In addition to monitoring sites, air quality is also monitored at several different locations with smaller individual measuring instruments. We monitor the concentrations of thoracic particles by 10 sensors along main streets and roads. We use sensors as a supplementary monitoring method, and the measurements are not used to monitor limit values. The sensor results are utilised, for example, to evaluate the need for dustbinding with a diluted saline solution on the main routes during the spring street dust season.
