The Car-Free Sunday resulted in an overall improvement in air quality, with a significant decrease in concentrations of several pollutants. Areas around the busiest traffic routes saw the greatest improvements in air quality.
At the Kunst-Wet measuring station, concentrations of NO and NO2 both decreased by 80% compared with an average Sunday.
When compared to the concentrations recorded on an average weekday the decrease is greater still.NO and NO2 concentrations were down by 90% and 86% respectively compared with their normal weekday levels.
Fewer cars, less noise
Fewer cars also meant less noise. The monitoring stations across Brussels observed a big decrease in background noise from traffic during Car-Free Sunday.
Noise levels were down by as much as 90% at monitoring stations the near to motorways such as the E411 in Oudergem and the E40 in Sint-Lambrechts-Woluwe. Meanwhiler, background 68% noise levels were down along the Houba de Strooperlaan in Laken and the Waversteenweg in Oudergem.