The Aircraft Particle Emissions eXperiment (APEX) was conducted at NASA’s Dryden Flight Research Center April 2004 to afford the scientific community an opportunity to systematically investigate the emissions of a commercial-class aircraft, NASA’s DC-8, during ground-based operation. APEX included participants from more than ten institutions, each providing unique measurement capabilities for trace gas and/or particle species.


JETS APEX2 was conducted at the Oakland International Airport in August 2005 to was to develop TOG and PM speciation profiles for engines used in older (CFM56-3) and newer (CFM56-7) Boeing 737-type commercial aircraft burning standard Jet A fuel.


The main objective of APEX3 was to advance the knowledge of aircraft engine particle emissions. APEX3 was conducted at Cleveland Hopkins International Airport (CLE) from October 26 to November 8, 2005. In APEX3, as in the previous studies, engine exhaust emissions and plume development were examined by acquiring data from the exhaust nozzle and in the near-field plume from a range of stationary commercial aircraft.