Air quality regulations

There are many national and European-wide regulations set for the air that we breathe which aim to ensure a clean and healthy living environment. The most binding regulations concern the limit values of different air pollutants. The limit values define the maximum allowed impurity concentrations in the air for the protection of human health. If the limit value is exceeded, the municipality must prepare and implement air protection plans in order to go below the limit values. The European Parliament and Council Directive 2024/2881 on air quality and its improvement was published on November 20, 2024, and came into force on December 10, 2024. The directive must be transposed into national law within two years. The limit values are significantly tightened, which further supports the reduction of health risks from air pollution in the coming years. The new limit values must be achieved by January 1 2030, but compliance with them will be monitored from 2026 onwards.

The national guidelines specify the targets set for air quality, and they are mainly intended as instructions for the urban planners and authorities. The World Health Organization WHO has also issued health-based guidelines for the concentrations of other air pollutants. The guidelines issued by WHO are recommendations and based on harmful effects on human health that air pollutants have been proven to cause. The aim of the guidelines is to affect the development of air quality by setting targets in the short and long term.

Other regulations concerning the air are threshold values and target values. The threshold values define the level when a notification or warning about the elevated air pollutant concentrations must be issued. The threshold for issuing a warning is a concentration level in excess of which even a short-term exposure to air pollutants is a risk to health. A threshold for issuing a warning is set for ozone, nitrogen dioxide and sulphur dioxide. However, such high concentration levels do not occur in Finland and in the Helsinki Metropolitan Area. Target values refer to concentrations or load below which the value must fall, where possible, over a given period or after a longer period. The target values are slightly less binding than the limit values. 

Table 1. Current air quality limit values (The Government Decree on Air Quality 79/2017).

Table 1.1. Current air quality critical values for protection of natural ecosystems and vegetations.

Table 1.2. New air quality limit values to be attained by 2030 (Directive (EU) 2024/2881).

Table 2. Current air quality national guideline values (The Government decision on air quality 480/1996).

Table 3. Current air quality threshold values (VN asetus 79/2017)

Table 3.1. New air quality alert thresholds and information thresholds (Directive (EU) 2024/2881).

Table 4. Current target values for arsenic, cadmium, nickel, and benzo(a)pyrene (The Government Decree on Air Quality 79/2017)

Table 5. Target values for ozone (The Government Decree on Air Quality 79/2017).

*AQT40 is calculated in time period of 1.5.-31.7. of the hourly values ​​of the time between 9:00 and 21:00 Finnish standard time, which is 10:00 and 22:00 Finnish summer time.Table 5.1. New ozone target values to be attained by 2030 (Directive (EU) 2024/2881).

Table 6. WHOs' air quality guidelines for thoracic particles, fine particles and nitrogen dioxide (WHO 2021).