Chronic obstructive pulmonary disease (COPD) is a progressive respiratory disorder characterized by persistent airflow limitation, usually associated with chronic inflammation of the airways and lung tissue. Identification of risk factors is important in critical care nursing because early recognition and prevention can reduce acute exacerbations, respiratory failure, and hospital admissions. The most important risk factor for COPD is cigarette smoking. Active smoking causes chronic irritation and inflammation of the respiratory tract, damages cilia, increases mucus production, and leads to destruction of alveolar walls. The risk increases with the duration and intensity of smoking. Exposure to cigars, pipes, and other tobacco products can also contribute to COPD. Passive smoking or long-term exposure to second-hand smoke is another important risk, particularly in children and non-smoking adults. Occupational exposure to dust, chemical fumes, gases, and industrial pollutants can increase the risk of COPD. Workers in mining, construction, agriculture, textile, cement, and chemical industries may be exposed to harmful substances for prolonged periods. Inadequate workplace ventilation and lack of protective equipment further increase the risk. Indoor and outdoor air pollution are significant environmental factors. Burning biomass fuels such as wood,