Mobile sensors on buses improve air quality monitoring fairness

Static stations miss population groups

Dutch cities traditionally rely on fixed monitoring stations to identify health risks from particulate matter and nitrogen dioxide. These static sensors leave blind spots and do not represent the diversity of the urban population effectively. A study published in Scientific Reports demonstrates how GPS data from buses and trams can fill these gaps. Researchers combined this mobile data with detailed demographic information to measure exposure for different city dwellers.

Six vehicles cover most residents

Using CBS data on a 100-by-100-meter grid, the team analyzed coverage across groups categorized by age and migration background. If just six vehicles were fitted with sensors, they would represent 17.6 percent of all Amsterdam residents within 24 hours. During the entire seven-day period, the coverage reaches 26.2 percent of people and mirrors citywide averages more accurately. An interactive online dashboard allows local authorities to simulate scenarios and calculate needed vehicle routes for fair monitoring.

Strategic selection beats expensive sensors

Titus Venverloo from the AMS Institute notes that placing sensors risks overlooking pollution affecting specific groups without mobile expansion. Lead author Petar Koljenšić emphasizes that cities with limited vehicles can achieve enormous gains through strategic selection. Using twenty fully equipped vehicles allows monitoring of almost the whole accessible city in a demographically sound way. This approach avoids installing thousands of expensive sensors while ensuring social inclusion in environmental networks.