Press release 04/2021 from 16.02.2021 | Last changed: 29.04.2021
Air quality 2020: Only a few cities still exceed nitrogen dioxide limit
… ozone pollution. The alert threshold of 240 µg/m³ was not exceeded. The information threshold of 180 µg/m³ was exceeded on 13 days. The frequency with which the information threshold is exceeded varies greatly from year to year. The 2003 "summer …