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A slightly allergenic deciduous tree often used for making floors, furniture, carton boxes, and handles.

A fast-growing perennial plant found in meadows, near buildings, and in nitrate-rich soils. Nettle is sometimes used for salads, soups, tea, colouring, as a curdling agent, and in herbal remedies.

Deciduous trees, meaning they lose their leaves in autumn, mainly used for ornamental planting or shading in the United States.

A subtropical grass species that exists in most of the tropical and warm-temperate regions of the world. Bahia Grass is used as a forage and turf grass, as a ground cover, and is also used to control soil erosion in Asia, Africa, Europe, Australia, and the Pacific.

One of the most allergenic weeds in the world, pigweed is an insect and wind-pollinated plant commonly found in pasturelands, and farming fields.

Maple trees, also known as boxelder, are the source of maple syrup! These trees grow rapidly, which is why they are commonly found alongside roads, and in parks.

Cottonwoods grows rapidly and their wood is used for producing high-grade pulp, containers, furniture, and plywood.

Slow-growing trees that can live hundreds of years. Oaks are used for ornamental purposes and their acorns are food for squirrels, chipmunks, deer, etc.

Birch trees belong to the same family as alder, hazel, oak, and hornbeam trees, and are found in clearings and heathlands as well as grown in house gardens and parks.

White ash trees can grow at different altitudes and are found in forests, riverside groves, and meadows. They grow up to 120 feet in height and live around 200 years.

Known as a cosmopolitan mold, alternaria alternata is one of the most frequent fungal sensitizers. It is also the most common mold in dry, warm climates and can be found both outdoors (e.g., soil, plants) and indoors (e.g., wood, window frames).

One of the most significant allergy-causing agents in the Mediterranean. Olive trees are evergreen and thrive in dry summer seasons and cool, rainy ones.