The impact of an 8h ozone air quality standard on ROG and NOx controls in Southern California
| Autor: | David P. Chock, Sandra L. Winkler, T.Y. Chang, Barbara I. Nance |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
chemistry.chemical_classification
Atmospheric Science Ozone Meteorology Airshed Mesoscale meteorology Air pollution medicine.disease_cause Atmospheric sciences chemistry.chemical_compound chemistry Pollution prevention medicine Environmental science Volatile organic compound Air quality index NOx General Environmental Science |
| Zdroj: | Atmospheric Environment. 33:2471-2485 |
| ISSN: | 1352-2310 |
| DOI: | 10.1016/s1352-2310(98)00381-1 |
| Popis: | The new National Ambient Air Quality Standard for ozone in the US uses 8 h averaging for the concentration. Based on the 1993 ambient data for Southern California, 8 h averaging has a moderate tendency to move the location of the peak ozone concentration east of the location of the peak 1 h ozone concentration. Reducing the area-wide peak 8 h ozone concentration to 80 ppb would require an effective reduction of the area-wide peak 1 h ozone concentration to around 90 ppb. The Urban Airshed Model with improved numerical solvers, meteorological input based on a mesoscale model and an adjusted emissions inventory was used to study the effect of reactive organic gases (ROG) and NOx controls on daily-maximum and peak 8 h ozone concentrations under the 26–28 August 1987 ozone episodic conditions in Southern California. The NOx disbenefit remains prominent for the case of 8 h ozone concentration but is somewhat less prominent, especially when areal ozone exposure is considered, than the case for 1 h ozone concentration. The role of two indicators – O3/NOy and H2O2/HNO3 – for NOx- and ROG-sensitivity for 1 and 8 h ozone concentrations were also studied. In general, the indicator trends are consistent with model predictions, but the discriminating power of the indicators is rather limited. |
| Databáze: | OpenAIRE |
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