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  • 1 Reactor-ITN, Technological and Nuclear Institute, E.N. 10, 2686-953 Sacavém, Portugal
  • 2 CERENA-IST, Technical University of Lisbon, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal
  • 3 CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
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In 2006, elementary schools of inner-city Lisbon, Portugal were given questionnaires to identify respiratory problems. In 1,175 children aged 5–10 years, 27.7% reported rhinitis, 2.5% reported hay fever and 25.9% reported asthma symptoms. April and August were the months with higher incidence of rhinitis, with a considerable difference nonetheless (10.5% and 2.3%, respectively.). The former trends are addressed here by using meteorological data, PM2.5, and its elemental speciation. Mann-Whitney U-tests were applied to the data sets. Significantly higher values were found for humidity, K+, NH4 +, Sb and Zn in April, and for temperature, Cl, Mg2+ and Na+ in August. Commuter and heavy-duty traffic may contribute to rhinitis episodes.