The invention relates to a pollen or insect screen for applying to openings in buildings such as windows, doors or similar. Said screen consists of a bar, which is attached, in particular, above the opening o the building. According to the invention, the bar is provided with at least three guide mechanisms, which are aligned substantially parallel to one another and extended in the longitudinal direction of the bar, in addition to at least five substantially parallel screen strips, which are displaceably mounted by the guide mechanisms of said bar.