Tropospheric ozone is an important air pollutant, harmful to human health, agricultural crops and vegetation. It is the main precursor to the atmospheric oxidants which initiate the degradation of most reactive gases emitted to the atmosphere, and is an important greenhouse gas in its own right. We have developed a novel approach for the direct measurement of local chemical ozone production rates – a capability which avoids limitations inherent in emissions inventories and chemical mechanisms, and which explicitly distinguishes between the chemical and dynamical factors controlling local ozone production. Within this project, we will deploy the instrument at the PROPHET site – alongside other atmospheric instrumentation from other groups – to determine the detailed atmospheric oxidation environment at this location.