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Environmental protection

Viikinkaari 2a
00790 Helsinki
P.O. Box 58235, 00099 City of Helsinki
09 310 2611
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Dust suppression

The cities in the Helsinki metropolitan area have a joint emergency plan in case of a sudden weakening of air quality. When street dust concentrations become high, the Environment Services can submit a request for action irrigate street surfaces with a dilute calcium chloride solution.

The request can cover busy street traffic routes or the entire road network. The streets to be irrigated are listed in a separate map.

The irrigation is carried out using calcium chloride, as it keeps the dust moist for a long time and thus suppresses dust. The solution can also be used in sub-zero temperatures. In recent years, calcium chloride has been used for street suppression every spring.

When street dust concentrations in the city’s main routes rise, HSY sends a message to the Road Traffic Centre, from where the irrigation request is forwarded to the contractors responsible for maintaining the main routes.

12.07.2018 13:16