Many libraries have poor indoor air quality. The causes include inefficient heating, ventilation, and air conditioning (HVAC) systems, patrons who carelessly cough and sneeze, and patrons who wear heavy perfume or have inadequate hygiene. Poor air quality can affect library employees’ health. Improving a library’s air quality involves an investigation of its HVAC system, and repairs and the replacement of faulty parts as required. Employee observations regarding the air quality in their workspaces can be useful. These steps can contribute to an effective strategy for the improvement of a library’s indoor air quality.