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Stratification divides data into subgroups (e.g., smokers vs. non-smokers) to control confounding. It does not increase confounding (A) or randomize exposures (C). It may or may not lead to significance (D). CIHs apply stratification in exposure-response analyses.

Stack height and velocity disperse contaminants to prevent re-entry into buildings. Temperature (A) helps plume rise but less critical. Horsepower (C) and filters (D) don’t ensure dispersion. CIHs evaluate exhaust design per ASHRAE/ACGIH.

Capture velocity is the minimum velocity needed at the point of contaminant release to draw it into the hood. Duct velocity (A) ensures transport. Fan airflow (B) is downstream. Outdoor wind (D) is irrelevant. CIHs measure capture velocity with anemometers and compare to ACGIH guidelines.

Carbon monoxide is produced by incomplete combustion and binds hemoglobin, impairing oxygen transport. CO₂ (A) causes discomfort but not severe hypoxia at typical indoor levels. Radon (C) and ozone (D) have different health effects. CIHs monitor CO in homes and workplaces using portable detectors.

Radon exposure causes lung cancer, particularly in nonsmokers. Asthma (A), skin cancer (B), and heart disease (D) are unrelated. CIHs recommend radon monitoring and mitigation systems.