chhill_p3_process

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 * ideas**
 * compare number of people using the subway each year with air quality
 * compare number of people using the subway each year with population
 * compare amount of money spent on subway system with subway fare
 * compare amount of money spent on subway system with air quality
 * compare amount of money spent on subway system with air quality and number of riders per year
 * compare amount of money spent on subway system with amount of electricity being used


 * also look at solid waste and water quality

sketches

[|sketches.zip]