The text discusses the five-year assessment of air quality and the substances evaluated, including SO2, NO2, CO, benzene, O3, and particulate matter. It also mentions the legal basis for this assessment and the requirements for data quality. The text also references a regulation from the Minister of Environment in 2012 and discusses the role of societal norms in driving changes. It provides a comparison between modeled and measured data for several substances and discusses the permissible levels and target levels for air pollutants.