Nitryl chloride (ClNO₂) measurements from the Weybourne Atmospheric Observatory (WAO) are reported from March to April 2013 using a quadruple chemical ionization mass spectrometer with the I⁻ ionization scheme. WAO is a rural coastal site with generally low NO_x concentrations, a type of location poorly studied for ClNO₂ production. Concentrations of ClNO₂ exceeded that of the limit of detection (0.8 ppt) on each night of the campaign, as did concentrations of N₂O₅, which was also measured simultaneously with the Cambridge Broadband Cavity Enhanced Absorption Spectrometer. A peak concentration of 65 ppt of ClNO₂ is reported here. Vertical profiles of ClNO₂ from early- to middle-morning flights in close proximity to WAO are also reported, showing elevated concentrations at low altitude. The photolysis of observed ClNO₂ and a box model utilizing the Master Chemical Mechanism modified to include chlorine chemistry was used to calculate Cl atom concentrations. This model utilized numerous VOCs from the second Tropospheric Organic Chemistry project in 2004, at the same location and time of year. From this the relative importance of the oxidation of three groups of measured VOCs (alkanes, alkenes, and alkynes) by OH radicals, Cl atoms, and O₃ is compared. Cl atom oxidation was deemed generally insignificant at this time and location for total oxidation due to the much lower concentration of ClNO₂ observed, even following the night of greatest ClNO₂ production.