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Zabīd, nestled in the Al Ḩudaydah Governorate of Yemen, occupies a unique geographic position within the Tihāmah coastal plain. This plain, a narrow strip between the Red Sea and the mountainous interior, profoundly shapes the city’s environment and, consequently, its air quality. At an elevation of just a few meters above sea level (approximately 14.2000° N, 43.3167° E), Zabīd is highly susceptible to maritime influences and experiences a hot, humid climate. The surrounding landscape is predominantly flat, characterized by alluvial plains and wadis – seasonal riverbeds – that drain from the highlands. Historically, Zabīd flourished as an agricultural center, famed for its date palms and cotton production. While agriculture persists, the urban-rural gradient is becoming increasingly blurred with population growth. The proximity to the Red Sea introduces salt spray and influences wind patterns, often channeling air pollutants along the coast. The lack of significant topographical features to disperse pollutants, combined with potential dust from the surrounding arid lands, contributes to localized air quality challenges. The city’s urban character is defined by traditional mud-brick architecture, which, while culturally significant, can contribute to indoor air pollution if not well-maintained. The regional position, within a conflict zone, also impacts infrastructure and environmental monitoring capabilities.

Zabīd’s air quality follows a pattern dictated by the monsoon and prevailing wind systems. The period from May to September brings the southwest monsoon, characterized by increased humidity and occasional heavy rainfall. While the rain can temporarily cleanse the air of particulate matter, the high humidity fosters mold growth and can exacerbate respiratory issues. This period also sees increased maritime air masses, bringing with them salt particles. The drier months, October to April, are generally associated with poorer air quality. During this time, the prevailing winds carry dust and sand from the interior deserts, significantly increasing particulate matter concentrations. Temperature inversions, common during cooler nights, trap pollutants near the ground, worsening conditions. January and February are typically the driest and dustiest months, posing the greatest risk to sensitive individuals. For those with respiratory conditions, avoiding strenuous outdoor activity during these months is advisable. The summer months, despite the humidity, offer a slight respite due to the cleansing effect of rainfall, though mold allergies remain a concern. Monitoring wind direction is crucial; winds from the east and northeast are likely to carry more dust. Localized burning of waste, a common practice, further degrades air quality throughout the year, but is more noticeable during the drier season.