This dataset contains concentration measurements of atmospheric species performed at the Weybourne Atmospheric Observatory (WAO) on the North Norfolk coast. Measurements were all performed at ground level. Data was collected from 30th June till the 31st July 2015. This data was collected as part of Integrated Chemistry of Ozone in the Atmosphere (ICOZA) project, which aimed to apply in situ measurements to examine the response of the local atmospheric ozone production rate to NOx and VOC levels. The following instruments measured these species: LOPAP – Nitrous Acid (HONO) FAGE – OH, HO2, total organic RO2 Trace gases - NO, NO2, NOy, O3, SO2 and CO Gas chromatography (GC) - volatile organic compounds The measurements and data processing were performed by researchers from the Universities of Birmingham, East Anglia, Leeds and York. In-situ measurements of the ozone production rate are still in progress.