*Why does the map show that the air quality is good although there is a lot of dust on the street or near a construction site?
Unfortunately, the air quality map cannot as yet take into account very localised air pollution sources. The model is continuously being developed. In the future, it will be able to cover better the street dust situation. Dust from construction sites is not included in the model because, as of yet, there is not enough source information available on estimating and forecasting of local dust amounts.
*Why has the air quality become worse near my home although nobody in my neighbourhood for example burns wood in their fireplaces and the air feels fresh to breathe?
Wood burning has been taken into account at a very general level in the air quality map. The model sets as a default that wood is burned in fire places and houses similar to each other in the same way. However, in reality some never use their fire places and due to this, the model overestimates the air pollution concentrations in some areas. In turn, in some areas wood is burned more than average so the model underestimates the concentrations. Furthermore, some people can use their fireplaces in a proper manner and e.g. burn only dry firewood. The proper way to burn wood creates less emissions than an improper method.
*Why does the map show the air quality as being poor on a road with only very light traffic?
The traffic maps shown in the model may still include some minor errors. Due to this, the model can put down a pedestrian path as a road for motorised vehicles although cars have no access to it. Nor do the traffic maps, for example, take local traffic arrangements affected by construction works into account.
*Why is the air quality good in my neighbour’s yard when it is only satisfactory in mine although we both have the same distance to the next road?
The air quality map includes eight colour classes (in other words, no so-called colour sliding is used). Therefore, the colour changes directly from one colour class to another; for example from green to yellow although the difference in the air quality might be very small at the changing point. The graph in the pop-up window shows the air quality situation and forecast at the location chosen. The air quality is presented there through a sliding scale.
*Why is only a straight line shown at the bottom of the picture in the pop-up window?
The air quality map describes only the air quality outside. Therefore, if you tap into a building, no result is shown because the map has no information on the indoor air quality.
*What do the colours on the map mean?
Colours of the Air Quality Index are used in the air quality map. The colour green refers to good air quality and red represents poor air quality.
*Why is the air quality poorer in green areas and forests from time to time than it is in areas with heavy traffic?
The reason is often a high ozone concentration. Ozone in respiratory air differs from other air pollutants. Emissions contain no ozone; instead it is formed in the air due to the solar radiation in the chemical reactions of air pollutants. There is less ozone in urban centres and areas with heavy traffic than in suburbs or countryside because ozone is reduced when it reacts with other air pollutants.