This course discusses the strategies, designs, limitations, and sources of bias of environmental field sampling, with a focus on atmospheric emissions and concentration mapping. Students design their own field strategy for local sampling of greenhouse gases and air pollutants through stationary and mobile platforms. The accuracy of the results are discussed in the context of measurement specifications (precision, accuracy, drift, calibration methods), field sampling design, and atmospheric variability, including strategies to quantify or constrain systematic errors in the overall field design.