Spectrometry, FluorescenceFluorescent DyesPositron-Emission TomographyOtoacoustic Emissions, SpontaneousTomography, Emission-ComputedVehicle EmissionsFluorodeoxyglucose F18RadiopharmaceuticalsTomography, Emission-Computed, Single-PhotonGreenhouse EffectFluorine RadioisotopesCarbon FootprintAir PollutantsMethaneMultimodal ImagingAtmosphereTomography, X-Ray ComputedVolatilizationPentanesCarbon RadioisotopesEnvironmental MonitoringBrainGasolineFossil FuelsFluorescencePower PlantsVolatile Organic CompoundsCoalSpectrometry, X-Ray EmissionDenitrificationLuminescenceNitrous Oxide