Impact of environmental factors and Sahara dust intrusions on incidence and severity of COVID-19 disease in Spain. Effect in the first and second pandemic waves. - Linares, Cristina; Culqui, Dante; Belda, Fernando; López-Bueno, José Antonio; Luna, Yolanda; Sánchez-Martínez, Gerardo; Hervella, Beatriz; Díaz, Julio (Environmental Science & Pollution Research, 2021)