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Shāndīz, nestled in the Khorāsān-e Raẕavī province of Iran, occupies a unique geographic position within a semi-arid landscape. Located at coordinates 36.3961° N, 59.3092° E, the city sits at an elevation of approximately 1,400 meters (4,593 feet) above sea level, contributing to cooler temperatures and a distinct microclimate. The surrounding terrain is characterised by rolling hills and plains, part of the broader Kopet Dag mountain range foothills. Unlike cities bordering major water bodies, Shāndīz is relatively distant from significant surface water sources, relying heavily on groundwater resources. The urban-rural gradient is sharply defined; Shāndīz itself is a relatively small city with a population of under 14,000, quickly transitioning to agricultural lands dominated by dry farming and orchards. While not a major industrial hub, the region supports some localized processing of agricultural products. This, coupled with residential heating during colder months, contributes to localised pollution sources. The prevailing winds, generally from the west and northwest, can transport pollutants from regional sources, impacting air quality. The city’s location within a basin-like topography can also exacerbate pollution events by trapping air masses and hindering dispersion, particularly during stable atmospheric conditions. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Shāndīz.

Air quality in Shāndīz experiences a distinct seasonal cycle. Spring (March-May) often sees moderate pollution levels as snowmelt increases dust and agricultural activities begin, releasing particulate matter. Winds can be erratic, sometimes dispersing pollutants, other times concentrating them. Summer (June-August) typically offers the cleanest air, with higher temperatures promoting atmospheric mixing and rainfall occasionally scavenging pollutants. However, prolonged drought conditions can lead to increased dust storms. Autumn (September-November) marks a transition period, with decreasing temperatures and the onset of heating season. This leads to a gradual increase in particulate matter from wood and fossil fuel combustion. November is often the month with the most noticeable decline in air quality. Winter (December-February) represents the peak pollution season. Temperature inversions are common, trapping cold, dense air near the ground and concentrating pollutants from residential heating. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exposure during these months. Fog can also exacerbate conditions by trapping pollutants. Avoiding strenuous outdoor activity during calm, cold mornings in winter is advisable. Monitoring local conditions and heeding health advisories is crucial for protecting respiratory health throughout the year.