Yes, daily exposure to London plane trees can harm you, primarily by causing irritation from the microscopic hairs (trichomes) on their leaves and bark, which can lead to symptoms like coughing, itchy eyes, and skin irritation. While these hairs can trigger symptoms in a wide population due to their physical nature, they may also contribute to allergic reactions or worsen symptoms in people with existing allergies.
Irritant effects
Physical irritation: The microscopic hairs, or trichomes, that shed from the leaves and seed pods can be inhaled or come into contact with skin, eyes, and mucous membranes.
Respiratory issues: Inhaling the fibers can cause a physical irritation to the respiratory tract, potentially leading to coughing fits, throat irritation, and difficulty breathing, especially when cycling.
Ocular irritation: Contact with the eyes can lead to conjunctivitis (red, itchy, swollen eyes).Skin and other symptoms: The fibers can cause skin irritation and other symptoms like itchy lips.
Allergic effects
Allergic reactions: London plane trees can trigger or worsen hay fever symptoms in susceptible individuals due to pollen and the fibers themselves.
Respiratory and eye symptoms: Allergic reactions can manifest as rhinitis (stuffy or runny nose), conjunctivitis, and asthma.
Widespread impact: Studies show a significant rate of sensitization to plane tree pollen in areas with high exposure, such as parts of Europe and Australia.
Factors that increase exposure
Proximity: Living or working near London plane trees, especially in areas with a high concentration, increases daily exposure.
Time of year: The risk is generally higher during late spring and summer when the trees shed fibers and release pollen.
Outdoor activities: Activities like sitting at outdoor cafes or cycling can lead to higher exposure due to the proximity of the fibers and pollen in the air.
Reduced cleaning: Insufficient street cleaning can cause the fibers to accumulate on footpaths and other surfaces, increasing the potential for contact.