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Dundalk, Maryland, occupies a strategically important position within the Baltimore metropolitan area, nestled along the Patapsco River and bordering the industrial heartland of Baltimore County. Its coordinates (39.2704, -76.4942) place it within a relatively low-lying coastal plain, with elevations generally ranging from 50 to 150 feet above sea level. This topography contributes to a tendency for air stagnation, particularly during periods of calm weather. The surrounding landscape is a blend of urban development, industrial zones, and pockets of agricultural land, creating a complex interplay of pollution sources. Dundalk’s proximity to the Port of Baltimore, a major shipping hub, introduces emissions from maritime activities, including vessel exhaust and cargo handling. Further inland, the industrial belt of Baltimore County, characterized by manufacturing facilities and distribution centers, significantly influences the regional air quality. The urban–rural gradient is gradual; while Dundalk itself is a densely populated urban area, it transitions relatively quickly into suburban and agricultural landscapes to the north and west. The Patapsco River acts as a partial barrier to the west, influencing local wind patterns and potentially trapping pollutants. The Chesapeake Bay, a short distance to the east, also plays a role in regional weather systems and the dispersal of airborne contaminants. The city’s location within the broader Mid-Atlantic region means it is susceptible to air pollution transported from other urban centers and industrial areas, compounding local emissions.

Dundalk’s air quality experiences a distinct seasonal cycle driven by meteorological factors. Spring (March-May) often brings a mix of conditions; while increased sunlight promotes dispersion, the season’s characteristic temperature inversions – where a layer of warm air traps cooler air near the ground – can lead to pollutant accumulation, especially during calm days. Pollen levels also rise significantly, impacting respiratory health. Summer (June-August) typically sees better air quality due to stronger convective mixing, dispersing pollutants more effectively. However, hot, humid days can exacerbate ozone formation, a secondary pollutant created by reactions involving sunlight and vehicle emissions. Autumn (September-November) presents a complex picture. Cooler temperatures can trigger temperature inversions, similar to spring, while leaf decomposition contributes to particulate matter. The arrival of fall storms can also briefly improve air quality through wind dispersal. Winter (December-February) often witnesses the poorest air quality, characterized by frequent temperature inversions, reduced sunlight, and increased residential heating, which contributes to particulate matter and carbon monoxide. Fog, common during winter mornings, further traps pollutants near the ground. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during periods of stagnant air, particularly in the spring and winter. Monitoring local weather forecasts and air quality reports is crucial for informed decision-making regarding outdoor activities.