Southern California Air Quality Study: Peroxyacetyl nitrate (PAN) measurements. Final report

Technical Report · Thu Mar 23 23:00:00 EST 1989

OSTI ID:5730637

Williams, E L; Grosjean, D

Measurements of peroxyacetyl nitrate (PAN) were carried out as part of the 1987 Southern California Air Quality Study. While PAN has long been observed in Southern California air, the authors study yielded for the first time information on the spatial and seasonal variations of PAN in the South Coast Air Basin. The highest PAN concentration during SCAQS, 30 ppb, was recorded at the Claremont site. Sumertime levels of PAN exhibited a strong increase from coastal to inland locations (PAN levels at the 'control' site, San Nicolas Island, were < 1 ppb), and a corresponding shift in daily maxima from mid-day at coastal sites to late afternoon inland. Thus, spatial variations of PAN during the summer were consistent with considerations of photochemical production during transport. In contrast, levels of PAN during the fall phase of SCAQS were high at the coastal locations, e.g. 13-19 ppb at all five winter SCAQS sites on December 3, 1987. PAN concentrations aloft were up to 30 ppb and were comparable to (and often higher than) those measured at ground level.

• Research Organization: Grosjean (Daniel) and Associates, Inc., Ventura, CA (USA)
• OSTI ID: 5730637
• Report Number(s): PB-89-187322/XAB
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring &amp; Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION MONITORING
AIR QUALITY
CALIFORNIA
CHEMICAL REACTIONS
CHROMATOGRAPHY
DISTRIBUTION
DOCUMENT TYPES
ENVIRONMENTAL QUALITY
ENVIRONMENTAL TRANSPORT
ESTERS
FEDERAL REGION IX
GAS CHROMATOGRAPHY
MASS TRANSFER
NITRATES
NITRIC ACID ESTERS
NITROGEN COMPOUNDS
NORTH AMERICA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PEROXYACETYL NITRATE
PHOTOCHEMICAL REACTIONS
PROGRESS REPORT
SAMPLING
SEASONAL VARIATIONS
SEPARATION PROCESSES
SPATIAL DISTRIBUTION
USA
VARIATIONS