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Huaquillas, nestled in the El Oro province of Ecuador, occupies a geographically significant position on the southwestern coast, bordering Peru. Its coordinates, -3.4814, -80.2432, place it within a low-lying coastal plain, averaging around 10 meters above sea level. The city’s defining feature is its proximity to the Pacific Ocean, directly influencing humidity and prevailing winds. Huaquillas is part of a broader coastal ecosystem characterized by mangrove forests and estuaries to the south, gradually transitioning into agricultural lands – primarily banana and cacao plantations – as one moves inland. This agricultural belt contributes to localized air quality concerns, particularly during harvest seasons when machinery use and potential pesticide drift are elevated. The urban–rural gradient is relatively sharp; the city itself is compact, with a dense core radiating outwards, quickly giving way to smaller settlements and agricultural fields. The surrounding landscape is relatively flat, limiting natural air dispersion and potentially trapping pollutants. The Golfo de Jambelí, a sheltered bay, further influences local wind patterns, sometimes creating stagnant air conditions. While not directly adjacent to major industrial zones, Huaquillas serves as a crucial port city for regional trade, with associated shipping and logistical activities contributing to emissions. The terrain’s flatness and coastal location combine to create a microclimate susceptible to temperature inversions, especially during drier periods, which can exacerbate air pollution episodes.

Huaquillas experiences a tropical climate with distinct wet and dry seasons, significantly impacting air quality. The wet season, typically spanning November to April, brings consistent rainfall and increased humidity, generally leading to improved air quality due to atmospheric cleansing. Frequent rainfall washes particulate matter from the air, and higher humidity can trap some gaseous pollutants. However, heavy rainfall events can also mobilize dust and soil particles, temporarily degrading air quality. The dry season, from May to October, presents a different scenario. Reduced rainfall and lower humidity contribute to drier conditions, increasing the risk of dust storms, particularly from agricultural fields. Temperature inversions are more common during this period, trapping pollutants closer to the ground. The lack of consistent wind circulation during these inversions can lead to a build-up of emissions from vehicles, agricultural machinery, and localized industrial activities. Months like July and August often experience the most persistent inversions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting strenuous outdoor activities during the early morning and late afternoon when inversions are most likely. While the wet season generally offers respite, periods of intense agricultural activity, particularly during the transition months, can still result in elevated levels of particulate matter. Fog, common during the wet season, can also temporarily reduce visibility and trap pollutants in localized areas.