Dr Leigh Crilley has a PhD in Atmospheric Chemistry and is an internationally recognized air quality scientist with over 15 years international experience in air quality, with expertise in atmospheric chemistry, air quality monitoring and greenhouse gas emissions. Leigh is Charted Chemist with the Royal Australian Chemical Institute (RACI) and a Certified Air Quality Practitioner (CAQP). Leigh has participated in numerous international air quality projects spanning clean remote locations to some of the most polluted cities, including Australia, India, China, United Kingdom, United States, Canada, Spain, the Netherlands, France and Cape Verde. Leigh expertise is the sources and processes driving urban air quality and has contributed to over 50 research papers on air quality, instrumentation, atmospheric chemistry and meteorology. Since starting at WSP, Leigh has contributed and led air quality impact assessments, air quality monitoring projects in Queensland, South Australia and NSW across a range of industries.