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A dramatic shift in CO and CH4 levels at urban locations in Korea after the implementation of the Natural Gas Vehicle Supply (NGVS) program.

Abstract：

:Concentrations of carbon monoxide (CO) and methane (CH(4)) in air were measured at both urban roadside (U-RS) and urban background (U-BG) stations in Seoul, Korea over an 11 yr period (1996-2006). The overall mean values of CO were 1.16+/-0.63 (U-RS) and 1.08+/-0.77 ppm (U-BG), while those of CH(4) were 2.24+/-0.42 (U-RS) and 2.06+/-0.31 ppm (U-BG). The diurnal patterns of CO tended to peak near rush hour, while those of CH(4) showed increases at night. An examination of the seasonal data showed that the CO values were consistently higher during winter, while CH(4) values were highly variable across seasons with relatively large spatial variations. Because of the noticeable change in air quality parameters after the year 2000, the mean data for both compounds were examined between 1996-2000 (period I) and 2001-2006 (period II). The analysis of long-term trends revealed that the concentrations of both compounds decreased very rapidly during period I, while changes were not significant during period II. The results of this comparative study confirm that both urban locations have experienced dramatic changes in the major pollutant levels, particularly in CO after the implementation of the Natural Gas Vehicle Supply (NGVS) program.

journal_name

Environ Res

journal_title

Environmental research

authors

Thi Nguyen H,Kim KH,Ma CJ,Cho SJ,Ryeul Sohn J

doi

10.1016/j.envres.2010.03.002

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

396-409

issue

4

eissn

0013-9351

issn

1096-0953

pii

S0013-9351(10)00044-7

journal_volume

110

pub_type

杂志文章

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