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Birch pollen, air pollution and their interactive effects on airway symptoms and peak expiratory flow in allergic asthma during pollen season - a panel study in Northern and Southern Sweden.

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Title: Birch pollen, air pollution and their interactive effects on airway symptoms and peak expiratory flow in allergic asthma during pollen season - a panel study in Northern and Southern Sweden.
Authors: Carlsen, Hanne Krage1 (AUTHOR) hanne.krage.carlsen@amm.gu.se, Haga, Susanna Lohman1 (AUTHOR), Olsson, David2 (AUTHOR), Behndig, Annelie F3 (AUTHOR), Modig, Lars2 (AUTHOR), Meister, Kadri4 (AUTHOR), Forsberg, Bertil2 (AUTHOR), Olin, Anna-Carin1 (AUTHOR)
Source: Environmental Health: A Global Access Science Source. 7/6/2022, Vol. 21 Issue 1, p1-13. 13p.
Subject Terms: *Air pollution, *Pollen, *Particulate matter, *Asthma, *Nitrogen oxides, Allergic rhinitis, Expiratory flow, Dyspnea
Abstract: Background: Evidence of the role of interactions between air pollution and pollen exposure in subjects with allergic asthma is limited and need further exploration to promote adequate preventive measures. The objective of this study was to assess effects of exposure to ambient air pollution and birch pollen on exacerbation of respiratory symptoms in subjects with asthma and allergy to birch.Methods: Thirty-seven subjects from two Swedish cities (Gothenburg and Umeå) with large variation in exposure to both birch-pollen and air pollutants, participated in the study. All subjects had confirmed allergy to birch and self-reported physician-diagnosed asthma. The subjects recorded respiratory symptoms such as rhinitis or eye irritation, dry cough, dyspnoea, the use of any asthma or allergy medication and peak respiratory flow (PEF), daily for five consecutive weeks during two separate pollen seasons and a control season without pollen. Nitrogen oxides (NOx), ozone (O3), particulate matter (PM2.5), birch pollen counts, and meteorological data were obtained from an urban background monitoring stations in the study city centres. The data were analysed using linear mixed effects models.Results: During pollen seasons all symptoms and medication use were higher, and PEF was reduced in the subjects. In regression analysis, exposure to pollen at lags 0 to 2 days, and lags 0 to 6 days was associated with increased ORs of symptoms and decreased RRs for PEF. Pollen and air pollution interacted in some cases; during low pollen exposure, there were no associations between air pollution and symptoms, but during high pollen exposure, O3 concentrations were associated with increased OR of rhinitis or eye irritation, and PM2.5 concentrations were associated with increased ORs of rhinitis or eye irritation, dyspnea and increased use of allergy medication.Conclusions: Pollen and air pollutants interacted to increase the effect of air pollution on respiratory symptoms in allergic asthma. Implementing the results from this study, advisories for individuals with allergic asthma could be improved, minimizing the morbidities associated with the condition. [ABSTRACT FROM AUTHOR]
Copyright of Environmental Health: A Global Access Science Source is the property of BioMed Central and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Birch pollen, air pollution and their interactive effects on airway symptoms and peak expiratory flow in allergic asthma during pollen season - a panel study in Northern and Southern Sweden.
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  Data: <searchLink fieldCode="AR" term="%22Carlsen%2C+Hanne+Krage%22">Carlsen, Hanne Krage</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hanne.krage.carlsen@amm.gu.se</i><br /><searchLink fieldCode="AR" term="%22Haga%2C+Susanna+Lohman%22">Haga, Susanna Lohman</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Olsson%2C+David%22">Olsson, David</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Behndig%2C+Annelie+F%22">Behndig, Annelie F</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Modig%2C+Lars%22">Modig, Lars</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Meister%2C+Kadri%22">Meister, Kadri</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Forsberg%2C+Bertil%22">Forsberg, Bertil</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Olin%2C+Anna-Carin%22">Olin, Anna-Carin</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Environmental+Health%3A+A+Global+Access+Science+Source%22">Environmental Health: A Global Access Science Source</searchLink>. 7/6/2022, Vol. 21 Issue 1, p1-13. 13p.
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  Data: *<searchLink fieldCode="DE" term="%22Air+pollution%22">Air pollution</searchLink><br />*<searchLink fieldCode="DE" term="%22Pollen%22">Pollen</searchLink><br />*<searchLink fieldCode="DE" term="%22Particulate+matter%22">Particulate matter</searchLink><br />*<searchLink fieldCode="DE" term="%22Asthma%22">Asthma</searchLink><br />*<searchLink fieldCode="DE" term="%22Nitrogen+oxides%22">Nitrogen oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Allergic+rhinitis%22">Allergic rhinitis</searchLink><br /><searchLink fieldCode="DE" term="%22Expiratory+flow%22">Expiratory flow</searchLink><br /><searchLink fieldCode="DE" term="%22Dyspnea%22">Dyspnea</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: <bold>Background: </bold>Evidence of the role of interactions between air pollution and pollen exposure in subjects with allergic asthma is limited and need further exploration to promote adequate preventive measures. The objective of this study was to assess effects of exposure to ambient air pollution and birch pollen on exacerbation of respiratory symptoms in subjects with asthma and allergy to birch.<bold>Methods: </bold>Thirty-seven subjects from two Swedish cities (Gothenburg and Umeå) with large variation in exposure to both birch-pollen and air pollutants, participated in the study. All subjects had confirmed allergy to birch and self-reported physician-diagnosed asthma. The subjects recorded respiratory symptoms such as rhinitis or eye irritation, dry cough, dyspnoea, the use of any asthma or allergy medication and peak respiratory flow (PEF), daily for five consecutive weeks during two separate pollen seasons and a control season without pollen. Nitrogen oxides (NOx), ozone (O3), particulate matter (PM2.5), birch pollen counts, and meteorological data were obtained from an urban background monitoring stations in the study city centres. The data were analysed using linear mixed effects models.<bold>Results: </bold>During pollen seasons all symptoms and medication use were higher, and PEF was reduced in the subjects. In regression analysis, exposure to pollen at lags 0 to 2 days, and lags 0 to 6 days was associated with increased ORs of symptoms and decreased RRs for PEF. Pollen and air pollution interacted in some cases; during low pollen exposure, there were no associations between air pollution and symptoms, but during high pollen exposure, O3 concentrations were associated with increased OR of rhinitis or eye irritation, and PM2.5 concentrations were associated with increased ORs of rhinitis or eye irritation, dyspnea and increased use of allergy medication.<bold>Conclusions: </bold>Pollen and air pollutants interacted to increase the effect of air pollution on respiratory symptoms in allergic asthma. Implementing the results from this study, advisories for individuals with allergic asthma could be improved, minimizing the morbidities associated with the condition. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Environmental Health: A Global Access Science Source is the property of BioMed Central and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1186/s12940-022-00871-x
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      – Code: eng
        Text: English
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        PageCount: 13
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    Subjects:
      – SubjectFull: Air pollution
        Type: general
      – SubjectFull: Pollen
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      – SubjectFull: Particulate matter
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      – SubjectFull: Nitrogen oxides
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      – SubjectFull: Allergic rhinitis
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      – SubjectFull: Expiratory flow
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              Text: 7/6/2022
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