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Lermontov occupies a strategic position within the Stavropol Krai, nestled at the dramatic intersection where the Ciscaucasian plains transition into the rugged foothills of the Greater Caucasus Mountains. This specific topographical placement creates a complex urban character, blending a small-town residential atmosphere with a heavy industrial backbone. The city is closely tied to the Lermontov reservoir, which provides a critical hydrological balance to the region. Geographically, the city acts as a gateway to the mountainous south, but this proximity to the peaks significantly influences its local atmospheric dynamics. The terrain is characterized by gentle undulations that can trap pollutants, particularly when air currents from the mountains clash with the warmer plains. Industrially, Lermontov is dominated by large-scale chemical production facilities, including those focused on mineral fertilizers and polymers, which form a distinct industrial belt. This concentration of heavy industry, juxtaposed against the surrounding agricultural zones of the Stavropol steppe, creates a sharp urban–rural gradient. The presence of these factories means that the air quality is heavily dependent on the dispersion capacity of the local winds. When the air is stagnant, the valley-like effect of the foothills prevents pollutants from escaping, leading to localized concentrations of industrial emissions. Consequently, the city's geography doesn't just define its beauty or its economy but serves as the primary determinant for the respiratory health of its inhabitants, balancing mountain freshness with industrial output and smog.

The air quality narrative in Lermontov follows a distinct seasonal rhythm dictated by the Caucasian climate. During winter, the city often experiences atmospheric stability and temperature inversions, where a layer of warm air traps colder, polluted air near the ground. This period marks the peak of pollution, as industrial emissions and domestic heating smoke accumulate, making January and February the most challenging months for respiratory health. Spring brings a transition; however, the arrival of warmer weather often coincides with agricultural burning in the surrounding Stavropol plains, introducing particulate matter that can spike AQI levels. Summer typically offers the cleanest air, as stronger convective currents and frequent thunderstorms help scrub the atmosphere of chemical pollutants and dust. This is the ideal window for outdoor activities and sports. Autumn introduces a new set of risks as the air cools and wind patterns shift, occasionally bringing smog back into the urban basin before the winter freeze sets in. For sensitive groups, including children and the elderly, the winter inversion periods require particular caution, with a recommendation to limit prolonged outdoor exposure during stagnant wind conditions. Health guidance emphasizes the importance of monitoring local industrial alerts during the colder months. By understanding these cycles, residents can better navigate the intersection of the city's industrial productivity and the natural volatility of the North Caucasus weather, ensuring they prioritize indoor air filtration during the winter peaks and smog.