the first one to left unsure but next to it is N2O, H2O and CO2 is the last one

below, and identify the in your breath using infrared spectroscopy. 100 90 80 70 60 % Transmittance 50 40 30 20 10 0 4000 3600 3200 2800 2400 2000 1800 1600 1400 1200 1000 800 600 Wavenumber (cm-1) 400