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Advances in Dermatology and Allergology/Postępy Dermatologii i Alergologii
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1/2020
vol. 37
 
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Original paper

Building age, type of indoor heating and the occurrence of allergic rhinitis and asthma

Barbara Piekarska
1
,
Konrad Furmańczyk
1, 2
,
Stanisław Jaworski
1, 3
,
Bożenna Stankiewicz-Choroszucha
1
,
Edyta Krzych-Fałta
1
,
Artur Z. Białoszewski
1
,
Anna Kłak
1
,
Bolesław K. Samoliński
1

1.
Department of Prevention of Environmental Hazards and Allergology, Medical University of Warsaw, Warsaw, Poland
2.
Department of Applied Mathematics, Faculty of Applied Informatics and Mathematics, Warsaw University of Life Sciences, Warsaw, Poland
3.
Department of Econometrics and Statistics, Faculty of Applied Informatics and Mathematics, Warsaw University of Life Sciences, Warsaw, Poland
Adv Dermatol Allergol 2020; XXXVII (1): 81-85
Online publish date: 2020/03/09
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Introduction

The impact of indoor conditions on health has been a subject of interest for researchers from various disciplines for many years. Air quality, lighting, indoor temperature, noise, humidity, mould, presence of heavy metals, neglect of hygiene and overcrowding are just some of the factors that generate residents’ health problems. Modern living conditions have far-reaching implications related to lifestyle or dietary habits as well as our work/home microenvironments. Studies have shown that up to 30% of people report general malaise, constant fatigue, headaches, dizziness, irritation of the eyes and skin, and difficulty breathing, a constellation of symptoms termed “sick building syndrome” [15]. Adults living in developed countries, especially those inhabiting urban areas, now spend, on average, over 80% of their time indoors [49]. Other studies place this figure as high as 60–90% [10]. This percentage may be even higher among children as well as elderly and sick people, making these groups theoretically most severely exposed to indoor airborne factors harmful to health [7].

Indoor air quality is a term referring to air quality inside buildings as it relates to various parameters such as temperature, humidity, ventilation and the presence of indoor chemical or biological contaminants. Clean air in the home is very important for the health of the population as a whole and especially for vulnerable populations, such as infants, children, the elderly or individuals already suffering from respiratory or allergic conditions. Many factors related to indoor living may have an impact on allergic diseases and those most frequently mentioned in the literature include:

  • ambient temperature, humidity, and impurities from the outdoor environment;

  • regional climate;

  • construction materials and maintenance of the building;

  • air conditioning type;

  • interior appliances [6].

Aim

Determine the effects of building age, heating system type and use of various indoor appliances on the occurrence of allergic rhinitis (AR) and asthma.

Material and methods

The aim of this study was to determine the effects of building age, heating system type and use of various indoor appliances on the occurrence of AR and bronchial asthma (BA) among the participants of the Epidemiology of Allergic Diseases in Poland (ECAP) project. ECAP used the methodology of the International Study of Asthma and Allergies in Childhood (ISAAC) and the European Community Respiratory Health Survey (ECRHS). The study areas were selected according to the ECRHS guidelines.

ECAP involved the populations of the eight largest urban agglomerations in Poland and additionally one rural region, also with a population of over 150 000 inhabitants since the rural population accounts for 39% of the entire Polish population. The study group was selected randomly from the Polish Resident ID Number (PESEL) registry at the Ministry of the Interior and Administration.

The research tool used in the study was the European Community Respiratory Health Survey (ECRHS) and International Study of Asthma and Allergies in Childhood (ISAAC) study questionnaire, adapted to European conditions (Middle and Eastern Europe) and used as part of the implementation of the System for the Prevention and Early Detection of Allergic Diseases in Poland study. It was a two-stage study, with the first stage involving subject enrolment (22,703 respondents) based on the questionnaire with the help of a PDA (Personal Digital Assistant). This survey-based study used translated and validated ECRHS and ISAAC questionnaires as well as a physical examination conducted according to ECRHS II standards.

The second stage involved 4,873 outpatient respondents who underwent additional diagnostic tests: skin-prick tests, lung function test, and peak nasal inspiratory flow (PNIF) evaluation. Clinical diagnoses of AR (including perennial AR and seasonal AR) and BA were verified based on the Allergic Rhinitis and its Impact for Asthma (ARIA) and Global Initiative for Asthma (GINA) guidelines. Only data from cities were analysed due to the dissimilar nature of urban and rural housing and their indoor furnishings (heaters, appliances, etc.). The questionnaire consisted of questions concerning health, respiratory diseases and symptoms of allergic diseases and asthma.

Statistical analysis

Differences in the prevalence of allergic diseases and asthma depending on the age of the building, the indoor heating method used in the building, and furnishings were expressed using odds ratios (OR) for contingency tables with a 95% confidence interval (95% CI). Statistical analysis was performed using the contingency tables and the χ2 test of independence. Statistical differences (dependence) were considered as significant at p < 0.05 for the χ2 test. The following age categories were established for analysis of current housing age: 1900–1945, 1946–1970, 1971–1990, and > 1990. Months were also grouped into seasons (spring, summer, autumn and winter) for analysis of temporal trends in the presence of symptoms associated with allergic rhinitis.

Results

The questionnaire data revealed that the negative impact of indoor air quality on the presence of allergic rhinitis occurred most frequently in homes built in the years 1971–1990. People living in these buildings often reported allergic rhinitis (Table 1).

Table 1

The occurrence of AR versus year of construction of the house currently inhabited and the presence of central heating

FactorSelf-reported allergic rhinitisOdds ratio (OR*)95% confidence interval (CI) for ORP-value of χ2 test
NoYes
Year of construction of building (age of building):
 1900–19451243334
 1946–197032989551.07760.93621.24030.2972
 1971–1990476914741.15021.0051.31540.0407
 > 199027088181.12410.97351.29810.1108
Central heatingNo1711449
Yes1265737431.12531.00791.25630.0355

* ORs for year of construction were calculated against data for 1900–1945.

Use of central heating may also influence the effect of these factors and intensify symptoms of seasonal allergic rhinitis of apartment residents living in buildings constructed after 1990. This finding correlated with clinical examination results (Table 2).

Table 2

The occurrence of SAR versus year of construction of the house currently inhabited and the presence of central heating

FactorRecognized seasonal allergic rhinitis nasalThe odds ratio (OR)95% confidence interval (CI)P-value
NoYes
Year of construction of a building (age of building):
 1900–194523730
 1946–1970389721.462210.92722.30580.1006
 1971–19906761331.554281.01832.37230.0397
 > 19904971011.605431.03822.48260.0321
Central heating in the buildingNo26835
yes1,9283661.453581.00442.10340.0461

[i] *ORs for year of construction were calculated against data for 1900–1945.

As opposed to AR, people living in buildings with central heating less often reported the occurrence of asthma (Table 3). A clinical examination confirmed that central heating reduced the symptoms of moderate asthma (Table 4).

Table 3

Self-reported asthma in relation to the presence of central heating. Odds ratio for self-reported asthma with regard to the presence of central heating

Central heating in the buildingSelf-reported asthmaOdds ratio (OR)95% confidence interval (CI) for ORP-value of χ2 test
NoYes
No2022140
Yes157207200.66150.550.79741.28e–5
Table 4

Correlation between diagnosed moderate asthma and the presence of central heating in the building

Central heating in the buildingModerate asthma diagnosedThe odds ratio (OR)95% confidence interval (CI) for ORP-value of χ2 test
NoYes
No48717
Yes4227520.35240.20210.61420.0001

Statistical analysis relating to the presence of heating appliances fired by solid fuel confirmed their impact on problems with breathing (such as wheezing, tightness in the chest or shortness of breath) (Table 5).

Table 5

Problems with breathing (such as wheezing, tightness in the chest and shortness of breath) in relation to the type of the home/water heating system using an open coal, coke or wood-fired furnace

Coal-, coke- or wood-fired furnace for heating home (water)Problems with breathing (such as wheezing, tightness in the chest and shortness of breath)The odds ratio (OR)95% CI for ORP-value of χ2 test
NoYes
No1548669
Yes1821071.360371.053741.756210.0178

Medical examination of respondents who used solid fuel (coal, coke or wood) for water heating or in an open furnace showed increased presence of moderate asthma (OR = 2.90080, 95% CI: 1.69773–4.95641, p = 0.0000457) and severe asthma (OR = 2.20592, 95% CI: 1.255283–3.876510, p = 0.004797). This also applies to residents of homes equipped with gas stoves, used for home water heating. They more often reported wheezing and breathing difficulty (OR = 1.219709, 95% CI: 1.098635–1.3541267, p = 0.000193).

Discussion

Other gas appliances or solid fuel equipment used for home water heating had no significant effect on the occurrence of respiratory symptoms in the respondents.

The results from our institution as well as research centres around the world, including China, Great Britain, Canada and Sweden, confirm the complex nature of the relationship between indoor environmental factors and irritants and allergic diseases [2, 3, 8, 11]. Indoor air quality deserves special attention because it is present in the area where people spend the greater part of the day, and recent studies indicate that the concentration of toxic substances in indoor air often exceeds concentrations measured outdoors. ECAP results confirm that air quality is affected by building age, heating system type and indoor appliances used. Even though we did not perform measurements of concentrations of chemicals released from sources located in indoor areas, our results are consistent with the available literature [9, 11, 12].

In cities, the biggest influence of indoor factors was noted in buildings erected in the years 1946–1990. Construction materials used for residential buildings in Poland in these years evolved with technological capabilities and were dependent on the availability of specific raw materials.

Common building and finishing materials may contain harmful substances that may pose a risk to allergy sufferers, including formaldehyde and volatile organic compounds (VOCs) [2, 3, 5, 8, 9, 1113].

A significant threat for people suffering from asthma is central heating, which itself is not an allergen, but, by reducing humidity, increases persistent cough, shortness of breath and tightness in the chest. Hot radiators and closed windows make the skin and mucous membranes very dry. Optimal humidity in the room is 45–55%; in winter it is often reduced by half, sometimes even falling below 10%. Many people start complaining about sneezing or a runny or blocked nose not caused by a cold or another infection.

Central heating may also cause exposure to other indoor allergens such as house dust mites [1416]. Due to the accumulation of house dust mite allergens and reduced air ventilation in autumn and winter, seasonal allergic rhinitis reported by the participants of our study were more severe. Turning on the heating system increases air circulation and causes the house dust mite to rise along with the heated air. There are favourable conditions for exposure to the allergen accumulated during the summer [17].

There is conflicting evidence that suggests central heating systems both improve and aggravate asthma. This is obviously confusing, not to mention unsettling, especially for patients who want to ensure that they remain healthy. Data analysis showed an ameliorating effect of central heating on asthma. Central heating helps reduce humidity and maintain appropriate indoor temperature, which can be beneficial for people with asthma. Other heating technologies using solid fuels (wood, coal) and gas are not neutral for asthmatics [18].

Various heating technologies using solid fuels (wood, coal) and gas are shown to intensify symptoms of allergic diseases [8, 15, 16].

Although indoor air concentrations of these contaminants were not measured quantitatively in the ECAP study, the data on the types of heating technologies used indicate the types of contaminants that may be present and their potential for indoor sequestration and/or release.

Emissions from coal combustion contain a large amount of pollutants, such as particulate matter, carbon monoxide, sulfur dioxide, nitrogen oxides and organic toxins. When wood is burned, the problem is more complex, because wood smoke includes a wider range of ingredients forming a complex mixture of particles of different chemical composition and physical characteristics. This makes it difficult to identify which components are particularly harmful. Research conducted by Thorn et al. showed an increased risk of asthma associated with the use of coal-fired furnaces [18]. Gas furnaces are considered the main source of NO2 in the rooms. Studies show that people using these devices are more likely to have wheezing, shortness of breath, asthma attacks and allergic rhinitis [3, 8, 19].

Acknowledgments

The authors wish to thank colleagues for their valuable help in editing. The authors specially thank you for your cooperation: Prof. Anna Bodzenta-Łukaszyk, Prof. Anna Brêborowicz, Marta Chełmiñska MD, Daniel Paczesny PhD, Prof. Andrzej Emeryk, Prof. Andrzej Fal, Prof. Radosław Gawlik, Prof. Wiesław Gliñski, Teresa Hoffman MD, Prof. Mirosław Jarosz, Prof. Ewa Jassem, Prof. Piotr Kuna, Prof. Jerzy Kruszewski, Prof. Teresa Kulik, Prof. Marek Kulus, Prof. Grzegorz Lis, Prof. Sławomir Majewski, Prof. Michał Musielak, Prof. Barbara Rogala, Prof. Wojciech Silny, Prof. Andrzej Szpak, Prof. Jan Zejda.

Conflict of interest

The authors declare no conflict of interest.

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