Centro Nacional del Medioambiente;
Santiago;
Chile;
National Centre for Atmos- pheric Research;
Boulder;
Colorado;
USA;
Universidad Nacional de San Martín;
Buenos Aires;
Argentina;
Universidad Nacional de San Martín;
San Martín;
Buenos Aires;
Argentina;
Health; Air; Pollution; Climate; Variability; Carbon; Monoxide; Epidemiology;