Relationship between ozone air pollution and daily suicide mortality: a time-stratified case-crossover study in Taipei

Chun Yuh Yang, Yi Hao Weng, Ya Wen Chiu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Several studies suggested short-term exposure to air pollution might be associated with suicide mortality, although results have been inconsistent and vary depending upon the type of air contaminants. While seasonal variation associated with suicide was reported to occur and that in the spring and early summer there are peaks in ozone (O3) distribution, the relationship between these two parameters is not known. The aim of this study was to examine the potential association between O3 levels and daily mortality rate related to suicide in Taipei for the period 2004–2008 using a time-stratified case-crossover analysis. In our single pollutant model without adjustment for other pollutants, the risk of suicide increased by 11% on warm days and 15% on cool days for each interquartile range (IQR) rise in O3 concentration, respectively. The relationship was positive but did not reach significance. In our two-pollutant models, O3 remained non-significant on warm days after inclusion of one of any other ambient air contaminants into the model. However, on cool days, a significant association was found between O3 levels and enhanced risk of mortality due to suicide after nitrogen dioxide (NO2) or carbon monoxide (CO) were included. The overall positive but not significant findings of elevated risk of mortality frequently attributed to suicide on days with higher O3 levels suggest that outdoor exposures to this gaseous contaminant may contribute to increases in daily mortality rate related to suicide.

Original languageEnglish
Pages (from-to)261-267
Number of pages7
JournalJournal of Toxicology and Environmental Health - Part A: Current Issues
Volume82
Issue number4
DOIs
Publication statusPublished - Feb 16 2019

Fingerprint

Ozone
Air Pollution
Air pollution
Cross-Over Studies
Suicide
Impurities
Mortality
Nitrogen Dioxide
Carbon Monoxide
Air

Keywords

  • air pollution
  • case- crossover
  • daily mortality
  • Ozone
  • suicide

ASJC Scopus subject areas

  • Toxicology
  • Health, Toxicology and Mutagenesis

Cite this

@article{132eae88383b4b7e946926b331519f36,
title = "Relationship between ozone air pollution and daily suicide mortality: a time-stratified case-crossover study in Taipei",
abstract = "Several studies suggested short-term exposure to air pollution might be associated with suicide mortality, although results have been inconsistent and vary depending upon the type of air contaminants. While seasonal variation associated with suicide was reported to occur and that in the spring and early summer there are peaks in ozone (O3) distribution, the relationship between these two parameters is not known. The aim of this study was to examine the potential association between O3 levels and daily mortality rate related to suicide in Taipei for the period 2004–2008 using a time-stratified case-crossover analysis. In our single pollutant model without adjustment for other pollutants, the risk of suicide increased by 11{\%} on warm days and 15{\%} on cool days for each interquartile range (IQR) rise in O3 concentration, respectively. The relationship was positive but did not reach significance. In our two-pollutant models, O3 remained non-significant on warm days after inclusion of one of any other ambient air contaminants into the model. However, on cool days, a significant association was found between O3 levels and enhanced risk of mortality due to suicide after nitrogen dioxide (NO2) or carbon monoxide (CO) were included. The overall positive but not significant findings of elevated risk of mortality frequently attributed to suicide on days with higher O3 levels suggest that outdoor exposures to this gaseous contaminant may contribute to increases in daily mortality rate related to suicide.",
keywords = "air pollution, case- crossover, daily mortality, Ozone, suicide",
author = "Yang, {Chun Yuh} and Weng, {Yi Hao} and Chiu, {Ya Wen}",
year = "2019",
month = "2",
day = "16",
doi = "10.1080/15287394.2019.1589109",
language = "English",
volume = "82",
pages = "261--267",
journal = "Journal of Toxicology and Environmental Health - Part A: Current Issues",
issn = "1528-7394",
publisher = "Taylor and Francis Ltd.",
number = "4",

}

TY - JOUR

T1 - Relationship between ozone air pollution and daily suicide mortality

T2 - a time-stratified case-crossover study in Taipei

AU - Yang, Chun Yuh

AU - Weng, Yi Hao

AU - Chiu, Ya Wen

PY - 2019/2/16

Y1 - 2019/2/16

N2 - Several studies suggested short-term exposure to air pollution might be associated with suicide mortality, although results have been inconsistent and vary depending upon the type of air contaminants. While seasonal variation associated with suicide was reported to occur and that in the spring and early summer there are peaks in ozone (O3) distribution, the relationship between these two parameters is not known. The aim of this study was to examine the potential association between O3 levels and daily mortality rate related to suicide in Taipei for the period 2004–2008 using a time-stratified case-crossover analysis. In our single pollutant model without adjustment for other pollutants, the risk of suicide increased by 11% on warm days and 15% on cool days for each interquartile range (IQR) rise in O3 concentration, respectively. The relationship was positive but did not reach significance. In our two-pollutant models, O3 remained non-significant on warm days after inclusion of one of any other ambient air contaminants into the model. However, on cool days, a significant association was found between O3 levels and enhanced risk of mortality due to suicide after nitrogen dioxide (NO2) or carbon monoxide (CO) were included. The overall positive but not significant findings of elevated risk of mortality frequently attributed to suicide on days with higher O3 levels suggest that outdoor exposures to this gaseous contaminant may contribute to increases in daily mortality rate related to suicide.

AB - Several studies suggested short-term exposure to air pollution might be associated with suicide mortality, although results have been inconsistent and vary depending upon the type of air contaminants. While seasonal variation associated with suicide was reported to occur and that in the spring and early summer there are peaks in ozone (O3) distribution, the relationship between these two parameters is not known. The aim of this study was to examine the potential association between O3 levels and daily mortality rate related to suicide in Taipei for the period 2004–2008 using a time-stratified case-crossover analysis. In our single pollutant model without adjustment for other pollutants, the risk of suicide increased by 11% on warm days and 15% on cool days for each interquartile range (IQR) rise in O3 concentration, respectively. The relationship was positive but did not reach significance. In our two-pollutant models, O3 remained non-significant on warm days after inclusion of one of any other ambient air contaminants into the model. However, on cool days, a significant association was found between O3 levels and enhanced risk of mortality due to suicide after nitrogen dioxide (NO2) or carbon monoxide (CO) were included. The overall positive but not significant findings of elevated risk of mortality frequently attributed to suicide on days with higher O3 levels suggest that outdoor exposures to this gaseous contaminant may contribute to increases in daily mortality rate related to suicide.

KW - air pollution

KW - case- crossover

KW - daily mortality

KW - Ozone

KW - suicide

UR - http://www.scopus.com/inward/record.url?scp=85062991685&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85062991685&partnerID=8YFLogxK

U2 - 10.1080/15287394.2019.1589109

DO - 10.1080/15287394.2019.1589109

M3 - Article

C2 - 30870114

AN - SCOPUS:85062991685

VL - 82

SP - 261

EP - 267

JO - Journal of Toxicology and Environmental Health - Part A: Current Issues

JF - Journal of Toxicology and Environmental Health - Part A: Current Issues

SN - 1528-7394

IS - 4

ER -