Fill in the Blanks

Cities often (1) air quality to protect public health and to guide transport policy. Networks of sensors record (2) of pollutants such as nitrogen dioxide and fine particulate matter, which can penetrate deep into the lungs. However, readings (3) across neighbourhoods because traffic flow, building density, and wind patterns affect how emissions disperse. To interpret the data, researchers (4) ground measurements with satellite images and computer models. This approach can reveal pollution “hotspots” and evaluate whether interventions, like low-emission zones or expanded cycling lanes, actually reduce exposure. Clear communication of results is essential, since community support often determines whether long-term environmental plans are (5).