More severe allergic reactions to pollen can even trigger asthma attacks.
Apr 08, Pollen cloud forms as tree falls in neighborhood. More. A cloud of pollen rises as a tree-trimming company brings down a river birch tree in Tennessee. 04/08/ Pollen cloud. Apr 06, April 6,PM A large plume of pollen falls off falling tree near Beaman Lake in Raleigh's Brentwood neighborhood on Monday, April 5, The city is doing construction in the area.