What is new in this study is that Torrelavega (located in northern Spain) has far fewer inhabitants than the cities in the APHEA project; therefore, one would expect that levels of pollution from human sources (e.
Acute effects of particulate air pollution on respiratory admissions: Results from APHEA 2 Project.
Short term effects of air pollution on health: A European approach using epidemiologic time series data: the APHEA protocol.
Investigating regional differences in short-term effects of air pollution on daily mortality in the APHEA Project: A sensitivity analysis for controlling long-term trends and seasonality.
Short term effects of air pollution on emergency hospital admissions for respiratory disease: Results of the APHEA project in two major cities in The Netherlands, 1977-89.