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Alcázar de San Juan, nestled in the heart of the Castille-La Mancha region of Spain, occupies a strategic position on a gently undulating plateau. The city’s elevation, around 623 meters (2,044 feet), influences its climate and air quality. The surrounding landscape is dominated by the vast La Mancha plains, a historically agricultural zone primarily dedicated to cereal crops and vineyards. This extensive agricultural land use contributes to potential particulate matter pollution from field work and harvesting, alongside the use of fertilizers and pesticides. The urban–rural gradient is relatively sharp; the city itself is a concentrated area of activity, contrasting with the sparsely populated plains extending in all directions. While no major industrial belts directly border Alcázar de San Juan, regional industrial activity in nearby Toledo province can contribute to long-range transport of pollutants. The Tagus River, though not immediately adjacent, exerts a regional climatic influence. Prevailing winds, often from the northwest, can carry pollutants across the plains, impacting air quality within the city. The city’s historic centre, characterized by narrow streets and traditional building materials, can also trap pollutants, creating localized air quality variations. Understanding this interplay of geography, land use, and climate is crucial for assessing and mitigating air pollution in Alcázar de San Juan.

Air quality in Alcázar de San Juan exhibits a distinct seasonal pattern. Spring (March-May) often sees a rise in particulate matter due to agricultural activities – ploughing, sowing, and the potential for wind erosion of exposed soil. Pollen from local flora also contributes to respiratory irritants. Summers (June-August) are typically drier, with higher temperatures and stable atmospheric conditions. While rainfall helps cleanse the air, prolonged heat can exacerbate ozone formation, particularly on sunny days. Autumn (September-November) brings increased rainfall, generally improving air quality, but also a return to agricultural burning of crop residues, which can cause temporary spikes in PM2.5. Winter (December-February) is characterized by colder temperatures and increased use of solid fuel heating, particularly in older homes. This can lead to elevated levels of particulate matter and sulfur dioxide, especially during periods of temperature inversion when cold air becomes trapped near the ground. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these periods. Months to favour for outdoor activity are generally May-June and September-October, when temperatures are moderate and rainfall is sufficient to suppress dust and agricultural emissions.