Street dust has worsened Helsinki's air quality in a number of , according to data from HSY, the Helsinki Region Environmental Services Authority.
Some areas with relatively heavy traffic have seen "poor" to "very poor" air quality ratings, according to HSY.
However, more remote parts of the city not near busy roads had better air quality, the authority said.
HSY monitors air quality across the Helsinki metropolitan area, and posts information about it on its website.
Street dust can be particularly harmful to people with asthma or cardiac illnesses, but it can also cause symptoms in people without those medical conditions.
Street dust in the air can cause symptoms including a runny nose, cough, sore throat and irritated eyes.
At this time of year, the amount of street dust increases as snow and ice melt away and roads dry up, particularly increasing on sunny, dry days.
The street dust is primarily made up of finely ground asphalt and the grit used on roads and pavements during icy conditions. Vehicles outfitted with studded winter tyres in particular are known to wear down asphalt, grinding the material into dust.