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La calidad del aire en el Estado español durante 2019
traran superaciones o que hayan empleado la metodología establecida por la normativa para
las mediciones aleatorias
11
. La normativa establece un porcentaje de datos mínimo genérico
del 90% para considerar como válidos los datos de una estación, por lo que aplicar el criterio del
70% es incluso más conservador que lo exigido por la normativa.
11 En el Anexo V, apartado c) del Real Decreto 102/2011, se establece que: como excepción, se podrán aplicar
mediciones aleatorias en lugar de mediciones fijas para el benceno, las partículas y el plomo, si se puede
demostrar que la incertidumbre, incluida la derivada del muestreo al azar, alcanza el objetivo de calidad del
25%, y que la cobertura temporal sigue siendo superior a la cobertura temporal mínima de las mediciones
indicativas. [...] Si se efectúan mediciones aleatorias para evaluar los requisitos del valor límite de las partículas
PM
10
, debería evaluarse el percentil 90,4, que deberá ser inferior o igual a 50 μg/m
3
, en lugar del número de
superaciones, que está muy influenciado por la cobertura de los datos". En lo que se refiere a este informe solo
se han reflejado datos evaluados por este procedimiento para las superaciones del valor límite diario en PM
10
en Andalucía, Aragón, Cataluña, País Valenciano y Extremadura, además de las estaciones de la red EMEP/VAG/
CAMP, en las que en general se ha optado por utilizar este procedimiento.
16


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