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    Author(s): Andrzej Bytnerowicz; Michael Tausz; Rocio Alonso; David Jones; Ronald Johnson; Nancy Grulke
    Date: 2002
    Source: Environmental Pollution. 118: 187-203.
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Northwest Research Station
    PDF: Download Publication  (1.0 MB)


    Concentrations of air pollutants were monitored during the May–November 1999 period on a network of forested sites in Sequoia National Park, California. Measurements were conducted with: (1) active monitors for nitric oxide (NO), nitrogen dioxide (NO2) and ozone (O3); (2) honeycomb denuder/filter pack systems for nitric acid vapor (HNO3), nitrous acid vapor (HNO2), ammonia (NH3), sulfur dioxide (SO2), particulate nitrate (NO3), ammonium (NH4+, and sulfate (SO42–); and (3) passive samplers for O3, HNO3 and NO2. Elevated concentrations of O3 (seasonal means 41–71 ppb), HNO3 (seasonal means 0.4–2.9 µg/m3), NH3 (seasonal means 1.6–4.5 µg/m3), NO3 (1.1–2.0 µg/m3) and NH4+ (1.0–1.9 µg/m3) were determined. Concentrations of other pollutants were low. With increasing elevation and distance from the pollution source area of O3, NH3 and HNO3 concentrations decreased. Ammonia and NH4+ were dominant N pollutants indicating strong influence of agricultural emissions on forests and other ecosystems of the Sequoia National Park. Published by Elsevier Science Ltd.

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    Bytnerowicz, Andrzej; Tausz, Michael; Alonso, Rocio; Jones, David; Johnson, Ronald; Grulke, Nancy. 2002. Summer-time distribution of air pollutants in Sequoia National Park, California. Environmental Pollution. 118: 187-203.


    Ozone, nitrogenous pollutants, elevation gradient, forests, spatial variability, passive samplers.

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