Introduction: Environmental parameters of the workplace significantly influence employees’ health, well-being, and work performance. Inadequate indoor conditions may lead to discomfort, reduced productivity, and increased health risks. In addition to objective measurements, the inclusion of employees’ subjective perception is essential for a comprehensive assessment of indoor environmental quality, as individuals experience environmental conditions differently depending on personal characteristics, work tasks, and workplace features. Incorporating subjective perception enables a more comprehensive understanding of actual working conditions and a more accurate evaluation of indoor environmental quality. Purpose: The aim of this master thesis was to compare objective measurements of workplace environmental parameters with employees’ subjective perceptions and to assess the relationship between them across different types of workspaces within a selected company. Methods: The study was conducted in production areas, warehouse facilities, and office spaces of the selected company. Measurements of thermal parameters, lighting conditions, noise levels, and indoor air quality parameters were performed during two periods (spring and summer), allowing for the comparison of spatially different work environments and the consideration of seasonal variations in environmental conditions. Simultaneously, employees completed a questionnaire on subjective perception of environmental parameters, developed in accordance with the guidelines of the SIST EN ISO 10551:2020 standard. The measured values were compared with legislative requirements and recommended standard values. Results: The results demonstrated a relationship between objective measurements and subjective perceptions, particularly with respect to the thermal environment and noise. More pronounced deviations were identified in production areas, especially during the summer period, where employees reported increased discomfort. The differences between workspaces and seasons were clearly expressed and corresponded to the measured environmental loads. For lighting and indoor air quality, subjective evaluations were predominantly positive, although these perceptions did not always directly correspond to the measured values. Discussion and conclusion: The findings confirm that employees’ subjective perception represents an important complementary indicator to objective measurements and contributes to a more comprehensive assessment of workplace environmental quality. An integrated approach combining objective and subjective methods is essential for identifying environmental risks and for planning effective, targeted measures aimed at improving working conditions.
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