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Titolo:
Trends in exceedances of the ozone air quality standard in the continentalUnited States, 1980-1998
Autore:
Lin, CYC; Jacob, DJ; Fiore, AM;
Indirizzi:
Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA Harvard Univ Cambridge MA USA 02138 n & Appl Sci, Cambridge, MA 02138 USA Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA Harvard Univ Cambridge MA USA 02138 lanetary Sci, Cambridge, MA 02138 USA
Titolo Testata:
ATMOSPHERIC ENVIRONMENT
fascicolo: 19, volume: 35, anno: 2001,
pagine: 3217 - 3228
SICI:
1352-2310(200107)35:19<3217:TIEOTO>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
RURAL OZONE; AREAS;
Keywords:
air quality; air quality standard; ozone; ozone trends; ground-level ozone; surface ozone;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Jacob, DJ Harvard Univ, Div Engn & Appl Sci, Pierce Hall,29 Oxford St, Cambridge, MA02138 USA Harvard Univ Pierce Hall,29 Oxford St Cambridge MA USA 02138 USA
Citazione:
C.Y.C. Lin et al., "Trends in exceedances of the ozone air quality standard in the continentalUnited States, 1980-1998", ATMOS ENVIR, 35(19), 2001, pp. 3217-3228

Abstract

In 1997, the United States National Ambient Air Quality Standard (NAAQS) for ozone was revised from a l-h average of 0.12 parts per million (ppm) to an 8-h average of 0.08 ppm. Analysis of ozone data for the ensemble of the contiguous United States and for the period 1980-1998 shows that the average number of summer days per year in exceedance of the new standard is in the range 8-24 in the Northeast and in Texas, and 12-73 in southern California. The probability of exceedance increases with temperature and exceeds 20%in the Northeast for daily maximum temperatures above 305 K. We present the results of several different approaches to analyzing the long-term trendsin the old and new standards over the continental United States from 1980 to 1998. Daily temperature data are used to resolve meteorological variability and isolate the effects of changes in anthropogenic emissions. Significant negative trends are found in the Northeast urban corridor, in the Los Angeles Basin and on the western bank of Lake Michigan. Temperature segregation enhances the detection of negative trends. Positive trends occur at isolated sites, mostly in the Southeast; a strong positive trend is found in Nashville (Tennessee). There is some evidence that, except in the Southwest,air quality improvements from the 1980s to the 1990s have leveled off in the past decade. (C) 2001 Published by Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 18:40:46