Cardiorespiratory responses to low-level ozone exposure: The inDoor Ozone Study in childrEn (DOSE)

Jing Huang, Yi Song, Mengtian Chu, Wei Dong, Mark R. Miller, Miranda Loh, Junhui Xu, Di Yang, Rui Chi, Xuan Yang, Shaowei Wu, Xinbiao Guo, Furong Deng

Research output: Contribution to journalArticle

Abstract

Background: Indoor air pollution has emerged as a significant environmental and public health concern in recent years. However, evidence regarding the cardiorespiratory effects of indoor ozone is limited, and the underlying biological mechanisms are unclear, especially in children. Our study aimed to assess the cardiorespiratory responses to indoor ozone exposure in children. Methods: A repeated-measure study was conducted in 46 middle-school children in Beijing, China. Real-time concentrations of ozone, along with co-pollutants including particulate matter (PM) and black carbon (BC), were monitored in classrooms from Monday to Friday. Three repeated health measurements of cardiorespiratory functions, including ambulatory electrocardiogram (ECG), blood pressure, fractional exhaled nitric oxide (FeNO) and lung function, were performed on each participant. Mixed-effect models were used to evaluate the effects of indoor ozone exposure. Results: The mean (SD) indoor ozone concentration was 8.7 (6.6) ppb during the study period, which was largely below the current guideline and standards. However, even this low-level ozone exposure was associated with reduced cardiac autonomic function and increased heart rate (HR) in children. For instance, per interquartile range (IQR) increase in ozone at 2-hour moving average was associated with −7.8% (95% CI: −9.9%, −5.6%) reduction in standard deviation of all normal-to-normal intervals (SDNN), and 2.6% (95% CI: 1.6%, 3.6%) increment in HR. In addition, the associations were stronger at high BC levels (BC ≥ 3.7 μg/m3). No significant associations were found for airway inflammation and pulmonary function. Conclusions: Exposure to low-level indoor ozone that is not associated with respiratory effects was significantly related to disturbed cardiac autonomic function and increased HR in children, which suggested a possible mechanism through which ozone may affect cardiovascular health in children, and indicated more protective measures should be taken to alleviate the acute adverse effects of indoor ozone in this susceptible population.

Original languageEnglish (US)
Article number105021
JournalEnvironment International
DOIs
StatePublished - Oct 1 2019
Externally publishedYes

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ozone
black carbon
exposure
nitric oxide
public health
particulate matter
blood
effect
pollutant
rate

Keywords

  • Cardiorespiratory responses
  • Children
  • Indoor exposure
  • Low-level ozone

ASJC Scopus subject areas

  • Environmental Science(all)

Cite this

Cardiorespiratory responses to low-level ozone exposure : The inDoor Ozone Study in childrEn (DOSE). / Huang, Jing; Song, Yi; Chu, Mengtian; Dong, Wei; Miller, Mark R.; Loh, Miranda; Xu, Junhui; Yang, Di; Chi, Rui; Yang, Xuan; Wu, Shaowei; Guo, Xinbiao; Deng, Furong.

In: Environment International, 01.10.2019.

Research output: Contribution to journalArticle

Huang, J, Song, Y, Chu, M, Dong, W, Miller, MR, Loh, M, Xu, J, Yang, D, Chi, R, Yang, X, Wu, S, Guo, X & Deng, F 2019, 'Cardiorespiratory responses to low-level ozone exposure: The inDoor Ozone Study in childrEn (DOSE)', Environment International. https://doi.org/10.1016/j.envint.2019.105021
Huang, Jing ; Song, Yi ; Chu, Mengtian ; Dong, Wei ; Miller, Mark R. ; Loh, Miranda ; Xu, Junhui ; Yang, Di ; Chi, Rui ; Yang, Xuan ; Wu, Shaowei ; Guo, Xinbiao ; Deng, Furong. / Cardiorespiratory responses to low-level ozone exposure : The inDoor Ozone Study in childrEn (DOSE). In: Environment International. 2019.
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title = "Cardiorespiratory responses to low-level ozone exposure: The inDoor Ozone Study in childrEn (DOSE)",
abstract = "Background: Indoor air pollution has emerged as a significant environmental and public health concern in recent years. However, evidence regarding the cardiorespiratory effects of indoor ozone is limited, and the underlying biological mechanisms are unclear, especially in children. Our study aimed to assess the cardiorespiratory responses to indoor ozone exposure in children. Methods: A repeated-measure study was conducted in 46 middle-school children in Beijing, China. Real-time concentrations of ozone, along with co-pollutants including particulate matter (PM) and black carbon (BC), were monitored in classrooms from Monday to Friday. Three repeated health measurements of cardiorespiratory functions, including ambulatory electrocardiogram (ECG), blood pressure, fractional exhaled nitric oxide (FeNO) and lung function, were performed on each participant. Mixed-effect models were used to evaluate the effects of indoor ozone exposure. Results: The mean (SD) indoor ozone concentration was 8.7 (6.6) ppb during the study period, which was largely below the current guideline and standards. However, even this low-level ozone exposure was associated with reduced cardiac autonomic function and increased heart rate (HR) in children. For instance, per interquartile range (IQR) increase in ozone at 2-hour moving average was associated with −7.8{\%} (95{\%} CI: −9.9{\%}, −5.6{\%}) reduction in standard deviation of all normal-to-normal intervals (SDNN), and 2.6{\%} (95{\%} CI: 1.6{\%}, 3.6{\%}) increment in HR. In addition, the associations were stronger at high BC levels (BC ≥ 3.7 μg/m3). No significant associations were found for airway inflammation and pulmonary function. Conclusions: Exposure to low-level indoor ozone that is not associated with respiratory effects was significantly related to disturbed cardiac autonomic function and increased HR in children, which suggested a possible mechanism through which ozone may affect cardiovascular health in children, and indicated more protective measures should be taken to alleviate the acute adverse effects of indoor ozone in this susceptible population.",
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author = "Jing Huang and Yi Song and Mengtian Chu and Wei Dong and Miller, {Mark R.} and Miranda Loh and Junhui Xu and Di Yang and Rui Chi and Xuan Yang and Shaowei Wu and Xinbiao Guo and Furong Deng",
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T1 - Cardiorespiratory responses to low-level ozone exposure

T2 - The inDoor Ozone Study in childrEn (DOSE)

AU - Huang, Jing

AU - Song, Yi

AU - Chu, Mengtian

AU - Dong, Wei

AU - Miller, Mark R.

AU - Loh, Miranda

AU - Xu, Junhui

AU - Yang, Di

AU - Chi, Rui

AU - Yang, Xuan

AU - Wu, Shaowei

AU - Guo, Xinbiao

AU - Deng, Furong

PY - 2019/10/1

Y1 - 2019/10/1

N2 - Background: Indoor air pollution has emerged as a significant environmental and public health concern in recent years. However, evidence regarding the cardiorespiratory effects of indoor ozone is limited, and the underlying biological mechanisms are unclear, especially in children. Our study aimed to assess the cardiorespiratory responses to indoor ozone exposure in children. Methods: A repeated-measure study was conducted in 46 middle-school children in Beijing, China. Real-time concentrations of ozone, along with co-pollutants including particulate matter (PM) and black carbon (BC), were monitored in classrooms from Monday to Friday. Three repeated health measurements of cardiorespiratory functions, including ambulatory electrocardiogram (ECG), blood pressure, fractional exhaled nitric oxide (FeNO) and lung function, were performed on each participant. Mixed-effect models were used to evaluate the effects of indoor ozone exposure. Results: The mean (SD) indoor ozone concentration was 8.7 (6.6) ppb during the study period, which was largely below the current guideline and standards. However, even this low-level ozone exposure was associated with reduced cardiac autonomic function and increased heart rate (HR) in children. For instance, per interquartile range (IQR) increase in ozone at 2-hour moving average was associated with −7.8% (95% CI: −9.9%, −5.6%) reduction in standard deviation of all normal-to-normal intervals (SDNN), and 2.6% (95% CI: 1.6%, 3.6%) increment in HR. In addition, the associations were stronger at high BC levels (BC ≥ 3.7 μg/m3). No significant associations were found for airway inflammation and pulmonary function. Conclusions: Exposure to low-level indoor ozone that is not associated with respiratory effects was significantly related to disturbed cardiac autonomic function and increased HR in children, which suggested a possible mechanism through which ozone may affect cardiovascular health in children, and indicated more protective measures should be taken to alleviate the acute adverse effects of indoor ozone in this susceptible population.

AB - Background: Indoor air pollution has emerged as a significant environmental and public health concern in recent years. However, evidence regarding the cardiorespiratory effects of indoor ozone is limited, and the underlying biological mechanisms are unclear, especially in children. Our study aimed to assess the cardiorespiratory responses to indoor ozone exposure in children. Methods: A repeated-measure study was conducted in 46 middle-school children in Beijing, China. Real-time concentrations of ozone, along with co-pollutants including particulate matter (PM) and black carbon (BC), were monitored in classrooms from Monday to Friday. Three repeated health measurements of cardiorespiratory functions, including ambulatory electrocardiogram (ECG), blood pressure, fractional exhaled nitric oxide (FeNO) and lung function, were performed on each participant. Mixed-effect models were used to evaluate the effects of indoor ozone exposure. Results: The mean (SD) indoor ozone concentration was 8.7 (6.6) ppb during the study period, which was largely below the current guideline and standards. However, even this low-level ozone exposure was associated with reduced cardiac autonomic function and increased heart rate (HR) in children. For instance, per interquartile range (IQR) increase in ozone at 2-hour moving average was associated with −7.8% (95% CI: −9.9%, −5.6%) reduction in standard deviation of all normal-to-normal intervals (SDNN), and 2.6% (95% CI: 1.6%, 3.6%) increment in HR. In addition, the associations were stronger at high BC levels (BC ≥ 3.7 μg/m3). No significant associations were found for airway inflammation and pulmonary function. Conclusions: Exposure to low-level indoor ozone that is not associated with respiratory effects was significantly related to disturbed cardiac autonomic function and increased HR in children, which suggested a possible mechanism through which ozone may affect cardiovascular health in children, and indicated more protective measures should be taken to alleviate the acute adverse effects of indoor ozone in this susceptible population.

KW - Cardiorespiratory responses

KW - Children

KW - Indoor exposure

KW - Low-level ozone

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