… longer than 45 minutes. The IRK says that CO2 traffic lights can be used as an indicator of good or bad ventilation. Under normal conditions, a CO2 concentration of less than 1000 ppm (0.1 vol-%) in the interior indicates a hygienically adequate air exchange. Press release No. 36/2020 | … longer than 45 minutes. The IRK says that CO2 traffic lights can be used as an indicator of good or bad ventilation. Under normal conditions, a CO2 concentration …

… Indicator: Population-weighted particulate matter exposure (PM2.5 Annual mean of … as PDF (129.26 kB) Figure as Excel with data (45.32 kB) Overview Environmental Indicators last update on 25.09.2025 At a glance Population-weighted PM2.5 exposure …

… Indicator: Population-weighted particulate matter exposure (PM10) Annual mean of … as PDF (370.37 kB) Figure as Excel with data (45.88 kB) Overview Environmental Indicators last update on 25.09.2025 At a glance Population-weighted exposure to …

… Indicator: Energy consumption in manufacturing Primary energy consumption in … as PDF (344.30 kB) Figure as Excel with data (82.65 kB) Overview Environmental Indicators last update on 18.09.2024 At a glance Energy consumption in manufacturing …

… Indicator: Hot days Number of days when maximum air temperature exceeds 30 degrees … as PDF (142.85 kB) Figure as Excel with data (47.50 kB) Overview Environmental Indicators last update on 24.11.2025 At a glance The highest number of hot days …

… Indicator: Greenhouse gas emissions avoided by renewable energies Greenhouse gas … as PDF (167.32 kB) Figure as Excel with data (45.14 kB) Overview Environmental Indicators last update on 18.12.2025 At a glance Renewables are increasingly …

… Indicator: Primary energy consumption Development of primary energy consumption … as PDF (40.81 kB) Figure as Excel with data (41.08 kB) Overview Environmental Indicators last update on 18.12.2025 At a glance Primary energy consumption (PEC) in … to 2008. The ‘Greenhouse Gas Projections 2025’ by the German Environment Agency indicate that the measures taken so far will likely be insufficient to achieve this …

… Report, the development of groundwater levels requires greater attention. As indicated by data collected in the drought years of 2018 to 2020, the trend towards … has continued. The development in northern Germany is of particular concern (cf. Indicator WW-I-2 ). In the drought years, all over Germany record shortfalls were … in the gauging stations selected for discharge readings in the DAS Monitoring Indicators. Rising temperatures combined with water shortages in summer have grave …

… is true for the blue bars. There is a striking above-average number of blue bars indicated for the 1960s. For the past 10 years there are more yellow bars indicated. The multi-annual mean from 1961 to 1990 amounts to 239.4 millimetres. The … is true for the blue bars. There is a striking above-average number of blue bars indicated for the 1960s. For the past 10 years there are more yellow bars indicated. …

… are affected. Owing to the limited selection of gauging stations available for the indicator, not all flood events are covered. WW-I-4: Floodwater Source: Run-off … cause personal injury and material damage. The time series starting in 1961 clearly indicates that the floodwater regime varies considerably from year to year. This is …