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Step 3: Implement policies and programs

Evaluate programs

When planning and running an air quality program, cities need a clear way to gauge success and flag potential issues. A strong evaluation plan builds accountability, helps strengthen the case for future funding and creates opportunities to learn and improve while mitigating any negative impacts.

This section will help your city find tools to assess whether your programs are meeting clean air goals, such as reducing emissions, and to measure effects on air quality, public health and equity.

Designing a program evaluation: logic models

Logic models show how an air quality program is designed to work by linking inputs like funding, research and stakeholder input to activities (e.g. specific emissions reduction strategies), outputs (e.g. reduction in NOx emissions), outcomes (e.g. reduction in ambient ozone) and long‑term impacts (e.g. improvements in public health). 

Logic models help identify the right metrics and indicators to measure program effectiveness, such as emissions reductions or improvements in air quality and health. A strong logic model is a critical first step in program evaluation and serves as a shared guide for all stakeholders.

Example logic model for anti-idling diesel emission reduction program


Washington DC air pollution heatmap
Nitrogen dioxide pollution contributes to approximately 3,500 new childhood asthma cases every year in the Washington D.C. metro region.
New York City air pollution heatmap
Nitrogen dioxide pollution contributes to approximately 21,000 new childhood asthma cases every year in the New York metro region.
Philadelphia air pollution heatmap
Nitrogen dioxide pollution contributes to approximately 4,000 new childhood asthma cases every year in the Philadelphia metro region.
Chicago air pollution heatmap
Nitrogen dioxide pollution contributes to more than 10,000 new childhood asthma cases every year in the Chicago metro region.
Boston air pollution heatmap
Nitrogen dioxide pollution contributes to approximately 2,700 new childhood asthma cases every year in the Boston metro region.
Austin air pollution heatmap
Nitrogen dioxide pollution contributes to more than 1,800 new childhood asthma cases every year in the Austin metro region.
Baltimore air pollution heatmap
Nitrogen dioxide pollution contributes to more than 1,300 new childhood asthma cases every year in Baltimore metro region.

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