2018 AT Aerosol Techonology. Bilbao, España. 18-20 Mayo 2018 STUDY OF AIR POLLUTION IN SELECTED STATIONS IN SPAIN: ONE YEAR STUDY Abstract Poster ANNUAL EVOLUTION OF ULTRAFINE PARTICLES AND NEW PARTICLE FORMATION IN LEÓN (NW IBERIA) Abstract Poster A WINTER SAHARAN DUST INTRUSION AT LEÓN: AIR QUALITY AND HEALTH IMPACTS Abstract Poster