Local atmospheric pollution driven by traffic sources, with limited benefits from tree canopy sinks

Abstract Context Atmospheric reactive nitrogen is a major issue for urban residents both as a component of air pollution and as a nutrient input to urban ecosystems. However, patterns of atmospheric reactive nitrogen concentrations within a city are not well quantified spatially or temporally. Objectives We tested a source-sink framework, where traffic is the key source and tree canopy is a key sink, to understand patterns of intraurban atmospheric reactive nitrogen concentrations. By using a ne