In this activity, students will analyze their nitrogen oxide emissions from all sources (including coal-fired power plants, natural gas combustion, gas-powered lawnmowers, etc.) and combine them with vehicle emissions calculated in the previous activity (Ground-level Ozone: Your Vehicle) to derive an estimate of total emissions of smog-forming NOx. They will use an online nitrogen calculator and enter values for private transportation, public transportation, heat and power, and number of people living the household to receive the total emissions figure.

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