Quantification of CO2 and CH4 emissions from a small city across time and space.
Low pipeline leakage rates are likely due to few cast iron distribution pipelines.
Atmospheric monitoring records intermittent natural gas CH4 emissions from Ithaca.
Atmospheric CO2 isotope values correlate to natural gas use at nearby power plant.
High CO2 and CH4 concentrations observed on winds from power plant's direction.