Hanoi Orders Milk Tree Relocation Across Residential Streets
Hanoi officials have directed a comprehensive review and relocation plan for milk trees lining local streets. Truong Viet Dung, vice chairman of the Hanoi People’s Committee, instructed the Department of Construction on October 14 to coordinate with local authorities to examine high-density milk tree areas and propose the relocation of some of these trees and the planting of suitable replacement species.
Evaluating Environmental Odors and Health Impacts
The intense scent of blooming milk trees sparks varied physical reactions among pedestrians, ranging from pleasant sensations to severe discomfort. Dr. Nguyen Huy Hoang, a member of the Vietnam Society of Underwater and Hyperbaric Medicine, stated that individual reactions depend heavily on odor intensity, exposure duration, personal sensitivity levels, and overall health status. Dr. Hoang emphasized that strong, pervasive aromas alone do not automatically indicate chemical poisoning, noting that odor reactions, pollen allergies, and actual toxicities are distinct medical issues.
Olfactory irritants can stimulate sensory branches of the trigeminal nerve inside the nasal cavity, creating stinging, burning, or uncomfortable sensations. Furthermore, the olfactory system connects directly to brain networks that process emotion, sensation, and pain. A 2025 systematic review synthesizing 58 studies across 22,299 migraine patients estimated that approximately 47.8 percent of sufferers experienced odor aversion or sensitivity, while about 40.1 percent reported that strong scents triggered actual migraine attacks. Dr. Hoang explained that people with preexisting migraine conditions often show heightened sensitivity, where nausea and dizziness may accompany the pain regardless of environmental triggers.
Safety Precautions for Sensitive Populations
Individuals managing specific respiratory or neurological conditions require careful monitoring during seasonal blooming periods. Asthma sufferers must watch for warning signs such as coughing, chest tightness, wheezing, or shortness of breath, while patients with chronic obstructive pulmonary disease face increased vulnerability to airborne environmental factors. A study conducted in eastern India among 140 respiratory allergy patients found that 40 individuals, or 28.57 percent, showed positive skin prick test reactions to Alstonia scholaris pollen extract, though researchers noted this sample reflected only pre-diagnosed patients rather than the general population.
Medical guidance advises stepping away from heavily scented areas immediately upon experiencing discomfort. Dr. Hoang recommends that sensitive individuals alter travel routes, avoid lingering beneath blooming canopies, and temporarily shut windows facing floral sources. Health experts urge patients with chronic conditions to maintain their prescribed treatment regimens rather than self-medicating or increasing dosages to counter seasonal odors. Anyone experiencing acute symptoms—such as severe shortness of breath, rapidly worsening wheezing, unusually intense headaches, or new neurological signs—should seek immediate professional medical evaluation.
Tree Density Management and Urban Planning History
Hanoi currently maintains approximately 14,400 milk trees concentrated along major thoroughfares, including Nguyen Du, Tran Duy Hung, Trung Hoa, Trung Kinh, Duy Tan, Nguyen Chi Thanh, Quan Thanh, Le Van Luong, and Le Quang Dao. City planning officials are basing upcoming adjustments on comprehensive assessments of tree density, overall health, environmental impact, and public feedback. The municipal administration has explicitly prohibited mass felling or transplantation, prioritizing the preservation of healthy, centuries-old trees possessing high cultural and landscape value. Any relocated trees must receive proper replacement sites and dedicated care plans. In 2019, Hanoi relocated numerous milk trees from residential neighborhoods to the Nam Son solid waste treatment plant in order to lower local tree concentration.
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