Editorial
Is the Impact of Air Pollution on Mortality from Respiratory or Circulatory Causes Greater in Spain?
¿Es mayor en España el impacto de la contaminación atmosférica química sobre la mortalidad atribuible por causas respiratorias o por causas circulatorias?
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"tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "543" "paginaFinal" => "544" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "Cristina Linares, Gerardo Sánchez-Martínez, Julio Díaz" "autores" => array:3 [ 0 => array:3 [ "nombre" => "Cristina" "apellidos" => "Linares" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] ] ] 1 => array:3 [ "nombre" => "Gerardo" "apellidos" => "Sánchez-Martínez" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">b</span>" "identificador" => "aff0010" ] ] ] 2 => array:4 [ "nombre" => "Julio" "apellidos" => "Díaz" "email" => array:1 [ 0 => "j.diaz@isciii.es" ] "referencia" => array:2 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "aff0005" ] 1 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">*</span>" "identificador" => "cor0005" ] ] ] ] "afiliaciones" => array:2 [ 0 => array:3 [ "entidad" => "Departamento de Epidemiología y Bioestadística, Escuela Nacional de Sanidad, Instituto de Salud Carlos III, Madrid, Spain" "etiqueta" => "a" "identificador" => "aff0005" ] 1 => array:3 [ "entidad" => "The UNEP DTU Partnership, Copenhagen, Denmark" "etiqueta" => "b" "identificador" => "aff0010" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "¿Es mayor en España el impacto de la contaminación atmosférica química sobre la mortalidad atribuible por causas respiratorias o por causas circulatorias?" ] ] "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Air pollution accounted for more than 7 million premature deaths worldwide in 2012.<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> The largest published study of the burden of morbidity and mortality attributable to air pollution<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> found that it is associated with 36% of lung cancer deaths, 35% of deaths from chronic obstructive pulmonary disease, 34% of deaths from stroke, and 27% of deaths from heart disease, suggesting that the overall impact of pollution is greater on the respiratory system than on the cardiovascular system. Is this also true in Spain?</p><p id="par0010" class="elsevierStylePara elsevierViewall">In this paper we will only discuss the impact of chemical air pollution on mortality to distinguish it from the effect of noise pollution on mortality that has been the subject of another editorial in this journal.<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">A recent study in Spain analyzing mortality due to natural causes attributable to the short-term effects of chemical air pollution (classified under the ICD-10 headings: A00-R99<span class="elsevierStyleItalic">, excluding injuries and poisonings</span>) suggests that it is associated with 9267 deaths/year (95% CI: 4417−14,548).<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> But what proportions are attributable specifically to respiratory (ICD-10 J00-J99) and to circulatory (ICD-10 I00-I99) causes? The answer is not as clear, and depends on the pollutant analyzed and the health impact indicator in question.</p><p id="par0020" class="elsevierStylePara elsevierViewall">For particulate matter measuring less than 10 µs in diameter (PM<span class="elsevierStyleInf">10</span>), the random effects meta-analysis estimated the relative risk (RR) for short-term mortality from respiratory causes for Spain as a whole, calculated from the RR values obtained for 46 Spanish provinces in the period 2000−2009. For increments of 10 μg/m<span class="elsevierStyleSup">3</span> in the concentration of PM<span class="elsevierStyleInf">10</span>,<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> the RR is 1.026 (95% CI: 1.019–1.033), whereas for circulatory causes it is lower, at RR 1.009 (95% CI: 1.006–1.012).</p><p id="par0025" class="elsevierStylePara elsevierViewall">Taking into account the mean PM<span class="elsevierStyleInf">10</span> concentrations analyzed during the study period and the recorded daily mortality, the annual short-term mortality from respiratory causes attributable to this pollutant is 650 deaths/year (95% CI: 358−1025), whereas for circulatory causes it is lower, at 556 deaths/year (95% CI: 116−1012).</p><p id="par0030" class="elsevierStylePara elsevierViewall">In the case of nitrogen dioxide (NO<span class="elsevierStyleInf">2</span>), according to another study carried out to calculate the impact of this pollutant on short-term daily mortality in the Spanish provinces as a whole,<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> the RR for respiratory causes, for increments of 10 μg/m<span class="elsevierStyleSup">3</span> is 1028 (95% CI: 1020−1036) and 1016 (95% CI: 1012−1021) for circulatory causes. In other words, the RR is also higher for respiratory causes than for circulatory causes. However, taking into account the daily mortality from these specific causes and the daily mean concentrations of NO<span class="elsevierStyleInf">2</span> by provinces, short-term annual mortality attributable to NO<span class="elsevierStyleInf">2</span> would be 1030 deaths/year (95% CI: 466–1585) from respiratory causes, and mortality from circulatory causes would be almost twice that, at 1977 deaths/year (95% CI: 828−3197).</p><p id="par0035" class="elsevierStylePara elsevierViewall">Tropospheric ozone (O<span class="elsevierStyleInf">3</span>) is a secondary chemical pollutant, meaning that it is not emitted into the atmosphere from any source. Instead it is formed from other pollutants in the air called precursors that are usually present in urban atmospheres. In the case of this compound, its functional relationship with daily mortality is not linear, as observed for the concentrations of PM<span class="elsevierStyleInf">10</span> and NO<span class="elsevierStyleInf">2</span>, but quadratic,<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> i.e., there is a threshold value for each area analyzed (city) after which ozone starts to have an impact on health. Therefore, this variable must be parameterized in order to limit the statistical analysis to concentrations with an impact on health. This process results in an RR of 1.089 (95% CI: 1058−1120) for respiratory causes and of 1.025 (95% CI: 1.018–1.033) for circulatory causes for concentrations of 10 μg/m<span class="elsevierStyleSup">3</span> ozone above the health impact threshold for all Spanish provinces analyzed. In other words, the RR is higher for respiratory causes than for circulatory causes. However, the annual mortality attributable to ozone would be 126 deaths/year (95% CI: 54–194) for respiratory causes and 167 deaths/year (95% CI: 39–292) for circulatory causes.</p><p id="par0040" class="elsevierStylePara elsevierViewall">For the 3 pollutants analyzed, RR is higher for respiratory causes than for circulatory causes, indicating an increased risk of short-term mortality from these causes. However, daily mortality from circulatory causes (311 deaths/day) is higher than mortality from respiratory causes (106 deaths/day) in Spain between 2000 and 2009 in the 46 provincial capitals included in the study, so mortality attributable to air pollution is greater for circulatory than for respiratory causes. Thus, the short-term annual mortality attributable to air pollution for Spain as a result of PM<span class="elsevierStyleInf">10</span>, NO<span class="elsevierStyleInf">2</span> and O<span class="elsevierStyleInf">3</span> air pollutants would be 1806 deaths/year (95% CI: 878−2804) for respiratory causes and 2700 deaths/year (95% CI: 983−4501) for circulatory causes.</p><p id="par0045" class="elsevierStylePara elsevierViewall">To put these figures into context, we should point out that the annual mortality attributable to smoking in Spain between 2010 and 2014 was 51,870 deaths/year,<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a> i.e. short-term mortality attributable to air pollution is almost one fifth of that attributable to smoking and 3% of the total mortality that occurred during that period in Spain.<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> We should also remember that the values reported in that study only take into account short-term mortality. If other long-term diseases were included, mortality attributable to pollution would be around 38,600 deaths/year in 2015,<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a> a figure of the same order of magnitude as that attributed to smoking.</p><p id="par0050" class="elsevierStylePara elsevierViewall">To summarize, chemical air pollution is a major public health risk factor that significantly increases premature mortality from respiratory causes, among others. It is therefore essential to insist on the need to reduce concentrations of atmospheric pollutants by implementing evidence-based policies, particularly in the case of compounds such as particulate matter, for which no safe threshold has been determined.<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a> Similarly, a Surveillance Plan to monitor the effects of chemical air pollution on morbidity and mortality throughout Spain must urgently be set up in order to adequately monitor the health impacts on the population, especially among the most vulnerable groups (elderly, children, and pregnant women), in whom the effects are especially harmful, often precipitating premature death or increasing the burden of disease, leading to the loss of years of potentially healthy life.</p></span>" "pdfFichero" => "main.pdf" "tienePdf" => true "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as: Linares C, Sánchez-Martínez G, Díaz J. ¿Es mayor en España el impacto de la contaminación atmosférica química sobre la mortalidad atribuible por causas respiratorias o por causas circulatorias? 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