ARIZONA HAZARDOUS AIR-POLLUTANTS MONITORING PROGRAM

In order to evaluate the existing risk to public health in Arizona rel ated to hazardous air pollution, ambient air monitoring for selected h azardous air pollutants (HAPs) was carried out in 1994-1996 in several representative urban and rural areas of Arizona. A wide range of orga nic HAPs was monitored, requiring a variety of sampling and analysis m ethods. Stainless steel SUMMA canisters were used for collection of vo latile hydrocarbons and halocarbons, which were analyzed by capillary gas chromatography with name ionization and electron capture detection (GC-FID/ECD). Carbonyl compounds were collected using 2,4-dinitrophen ylhydrazine-impregnated cartridges and analyzed by high performance li quid chromatography with ultraviolet detection. Semi-volatile and non- volatile polycyclic aromatic compounds were collected using a sampling train consisting of a filter followed by a PUF/XAD-4/PUF sandwich car tridge. Following extraction, samples were analyzed by capillary GC wi th mass spectrometric detection (GCMS). Database software was develope d for data processing and reporting functions. This paper describes th e sampling strategy and the sampling and analysis methods employed in the monitoring program and presents a summary of all the results obtai ned during the duration of the sampling program.