Association between chemical components of PM 2.5 and children's primary care night-time visits due to asthma attacks: A case-crossover study

Few papers have examined the association between the chemical components of PM and health effects. The existence of an association is now under discussion. This case-crossover study aimed to examine the association between the chemical components of PM and night-time primary care visits (PCVs) due t...

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Bibliographic Details
Published in:Allergology international 2019-07, Vol.68 (3), p.329
Main Authors: Yamazaki, Shin, Shima, Masayuki, Yoda, Yoshiko, Kurosaka, Fumitake, Isokawa, Toshio, Shimizu, Shigeta, Ogawa, Teruhiro, Kamiyoshi, Naohiro, Terada, Kunihiko, Nishikawa, Jittoku, Hanaoka, Kenji, Yamada, Taku, Matsuura, Shinro, Hongo, Akihiro, Yamamoto, Ichiro
Format: Article
Language:English
Subjects:
Adolescent
After-Hours Care - statistics & numerical data
Air Pollutants - adverse effects
Air Pollutants - chemistry
Asthma - epidemiology
Asthma - etiology
Child
Child, Preschool
Cross-Over Studies
Environmental Exposure - adverse effects
Environmental Exposure - analysis
Female
Humans
Infant
Infant, Newborn
Japan - epidemiology
Male
Odds Ratio
Particle Size
Particulate Matter - adverse effects
Particulate Matter - chemistry
Primary Health Care - statistics & numerical data
Seasons
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Summary:Few papers have examined the association between the chemical components of PM and health effects. The existence of an association is now under discussion. This case-crossover study aimed to examine the association between the chemical components of PM and night-time primary care visits (PCVs) due to asthma attacks. The subjects were 1251 children aged 0-14 years who received medical care for asthma at a municipal emergency clinic. We measured daily average concentrations of hydrogen ion, sulfate ion, nitrate ion and water-soluble organic compounds (WSOCs), which are components of PM . We estimated the odds ratios (ORs) of PCVs per unit increment (inter quartile ranges) in each chemical component of PM for the subgroups of warmer months and colder months separately. No association was seen between PCVs and PM mass concentrations the day before the PCVs in either warmer or colder months. In the warmer months, an association was seen with the concentrations of WSOCs and hydrogen ion the day before the PCVs (OR = 1.33; 95% CI: 1.00-1.76, OR = 1.18; 95% CI: 1.02-1.36, respectively). Furthermore, a negative association was seen between sulfate ion and PCVs (OR = 0.85; 95%CI: 0.74-0.98). No associations were observed in the colder months. We observed a positive association between PCVs and certain concentrations of WSOCs and hydrogen ions in warmer months. In contrast, sulfate ion showed a negative association.
ISSN:1440-1592