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Montego Bay, Jamaica's second-largest city, occupies a strategic position on the island's northwestern coast in Middlesex County, where its geography profoundly shapes its air quality dynamics. Nestled within a natural harbor protected by the Bogue Islands, the city spreads across coastal plains that rise gently into the Cockpit Country's karst limestone hills to the south. This terrain creates a semi-enclosed basin effect that can trap pollutants, particularly when northeasterly trade winds weaken. The urban core clusters around the cruise ship terminal and Sangster International Airport, creating concentrated emission zones from maritime and aviation activities. Montego Bay's position along the Caribbean Sea exposes it to marine influences that typically disperse pollutants, but the city's rapid tourism-driven development has created an urban-rural gradient where construction dust from hillside resorts mingles with agricultural burning from surrounding sugarcane plantations. The city's low elevation (mostly under 100 meters) prevents significant temperature inversions but makes it vulnerable to sea breeze recirculation patterns that can return coastal emissions inland. Proximity to geothermal activity in the nearby volcanic regions occasionally introduces natural sulfur compounds, while the Martha Brae River valley to the east can channel pollutants during specific wind conditions. This complex interplay of coastal geography, urban expansion, and tourism infrastructure creates unique air quality challenges distinct from Jamaica's capital, Kingston.

Montego Bay's tropical monsoon climate creates distinct seasonal air quality patterns influenced by rainfall, wind regimes, and tourism cycles. During the dry season from December to April, pollution peaks occur from February through April when reduced precipitation allows particulate matter from construction, road dust, and vehicle exhaust to accumulate. These months coincide with peak tourist arrivals, increasing cruise ship emissions and traffic congestion. Northeast trade winds typically provide good dispersion, but occasional calm periods in March can lead to temporary pollutant buildup, particularly in the downtown basin. The rainy season from May to November brings relief through frequent showers that wash pollutants from the air, with September and October experiencing the cleanest air despite hurricane risks. However, the early rainy season (May-June) can see increased mold spores and organic compounds from decaying vegetation. Sensitive groups should avoid strenuous outdoor activities during late morning hours in peak pollution months when ozone levels rise with sunlight interacting with vehicle emissions. The hurricane season (June-November) introduces episodic poor air quality from storm-driven dust and post-storm mold proliferation. Winter visitors with respiratory conditions should monitor local air quality reports during February-March when Saharan dust occasionally reaches Jamaica. The city's marine location generally prevents extreme pollution episodes, but vulnerable populations should remain indoors during visible haze events, particularly when cruise ships are docked simultaneously.