Diesel vehicle emission and death rates in Tokyo, Japan: A natural experiment

Takashi Yorifuji, Ichiro Kawachi, Mariko Kaneda, Soshi Takao, Saori Kashima, Hiroyuki Doi

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Evidence linking air pollution with adverse cardiopulmonary outcomes is accumulating. However, few studies have been conducted to evaluate whether vehicle emission control improves public health. We thus evaluated the effect of a diesel emission control law on mortality rates in 23 wards of Tokyo metropolitan area, Japan. We obtained daily counts of mortality and concentrations of nitrogen dioxide (NO 2) and particulate matter less than 2.5μm in diameter (PM 2.5) from April 2003 to December 2008. Time-series and interrupted time-series analysis were employed to analyze the data in two periods: prior to the introduction of tighter restrictions (April 2003 to March 2006) and after the enforcement (April 2006 to December 2008). Concentrations of air pollutants gradually decreased during the study period: from 36.3ppb (NO 2) and 22.8μg/m 3 (PM 2.5) to 32.1ppb and 20.3μg/m 3, respectively. Air pollutants were positively associated with circulatory and pulmonary disease mortality, especially cerebrovascular disease. Each same-dayPM 2.5 increase of 10μg/m 3 was associated with a 1.3% increase in cerebrovascular mortality rate (95% confidence interval: 0.2-2.4). Rate ratios were attenuated after the enforcement in most of the outcomes, probably due to reduced toxicity of the pollutants. In the crude interrupted time-series analysis, reductions of standardized mortality rates after the enforcement were the greatest in high traffic areas. Even after adjustment of longer-time trend, mortality rate from cerebrovascular disease was reduced by 8.50% (p

Original languageEnglish
Pages (from-to)3620-3627
Number of pages8
JournalScience of the Total Environment
Volume409
Issue number19
DOIs
Publication statusPublished - Sep 1 2011

Fingerprint

Vehicle Emissions
Air Pollutants
Time series analysis
Emission control
traffic emission
diesel
Nitrogen Dioxide
mortality
Pulmonary diseases
Particulate Matter
Public health
Air
Air pollution
Toxicity
Time series
experiment
Experiments
emission control
time series analysis
Nitrogen

Keywords

  • Air pollution
  • Improved air quality
  • Mortality
  • Nitrogen dioxide
  • Particulate matter

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Waste Management and Disposal
  • Environmental Engineering

Cite this

Diesel vehicle emission and death rates in Tokyo, Japan : A natural experiment. / Yorifuji, Takashi; Kawachi, Ichiro; Kaneda, Mariko; Takao, Soshi; Kashima, Saori; Doi, Hiroyuki.

In: Science of the Total Environment, Vol. 409, No. 19, 01.09.2011, p. 3620-3627.

Research output: Contribution to journalArticle

Yorifuji, Takashi ; Kawachi, Ichiro ; Kaneda, Mariko ; Takao, Soshi ; Kashima, Saori ; Doi, Hiroyuki. / Diesel vehicle emission and death rates in Tokyo, Japan : A natural experiment. In: Science of the Total Environment. 2011 ; Vol. 409, No. 19. pp. 3620-3627.
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