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Terga, nestled within the Aïn Temouchent province of Algeria, occupies a geographically significant position along the Mediterranean coast, approximately 40 kilometers east of the provincial capital. Its coordinates (35.4167, -1.1833) place it within a gently sloping coastal plain, transitioning gradually to the foothills of the Tell Atlas Mountains to the south. The city’s terrain is characterized by relatively flat land, facilitating urban expansion, but also presenting challenges regarding air circulation. Terga’s proximity to the Mediterranean Sea (roughly 10 kilometers) introduces a maritime influence, moderating temperatures and contributing to humidity, but also potentially carrying marine aerosols and influencing local wind patterns. The surrounding landscape is a mix of agricultural land – primarily olive groves and cereal crops – and scrubland, typical of the Tell region. To the west, the landscape becomes increasingly rural, while to the east, it gradually merges with other coastal settlements. There's a discernible urban-rural gradient, with Terga acting as a local hub for surrounding agricultural communities. While Terga itself doesn't host major heavy industries, it benefits from its location within a broader industrial belt along the Algerian coast, potentially experiencing impacts from emissions originating further afield. The relatively low elevation (around 30 meters above sea level) can exacerbate air quality issues, particularly during periods of temperature inversion, as pollutants tend to accumulate closer to the ground. The prevailing northerly winds, common along this stretch of the Mediterranean, play a crucial role in dispersing or concentrating pollutants, depending on atmospheric conditions.

Terga’s air quality experiences a distinct seasonal cycle dictated by its Mediterranean climate. The warm, dry summers (June-August) often see a build-up of pollutants due to reduced rainfall and increased solar radiation, which promotes photochemical smog formation. Calm wind conditions during these months can trap emissions, leading to periods of poorer air quality. The intense summer heat also encourages increased vehicle use for air conditioning, further contributing to emissions. Conversely, the cooler, wetter months (October-March) generally bring improved air quality. Rainfall effectively ‘washes’ pollutants from the atmosphere, and stronger, more frequent winds disperse them. However, periods of fog, particularly in November and December, can trap pollutants near the ground, creating localized air quality concerns. Spring (April-May) and Autumn (September) represent transitional periods, with variable wind patterns and temperatures. During spring, dust storms originating from the Sahara can occasionally impact Terga, degrading air quality significantly. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the summer months, limiting strenuous outdoor activity during peak heat and pollution periods. The cooler, wetter months offer a more favourable window for outdoor pursuits, though vigilance regarding fog events remains important. Maintaining good hydration and avoiding prolonged exposure to areas with high traffic density are always advisable, regardless of the season. Public health advisories are typically issued during periods of elevated pollution, providing guidance on minimizing exposure and protecting vulnerable populations.