City Campaign. Air in the Canyons

• To engage urban planners, municipal air quality officers, traffic engineers, and local environmental NGOs to recognize how emission variability amplifies pollutant concentration peaks in dense street canyons.

• Share findings from deep canyon experiments demonstrating short-term spikes even when average emissions appear moderate.

• Encourage dialogue on exposure risks, monitoring practices, and potential mitigation awareness.

• Invite city authorities, traffic agencies, and building planners to adopt voluntary “Canyon Air Monitoring Notes” committing to track short-term concentration peaks.

• Encourage practical actions: deploy low-cost sensors at key intersections, publish brief monthly exposure summaries, adjust traffic signal timing or ventilation strategies experimentally, and share lessons with other neighborhoods to promote knowledge transfer and awareness.