Which of the following parameters is NOT commonly tested in water quality analysis?

Air pressure is not commonly tested in water quality analysis because it does not directly affect the chemical or biological quality of water. Water quality analysis typically focuses on parameters that indicate the health and safety of water for human consumption, ecosystem health, and adherence to regulatory standards.

pH is a critical parameter because it affects the solubility and biological availability of nutrients and contaminants in water. Turbidity, which measures the cloudiness or haziness of water due to suspended particles, is important as it can affect light penetration and the ability of aquatic plants to photosynthesize. Coliform bacteria are a key indicator of microbial contamination and overall water safety. Monitoring these parameters helps ensure that water is safe for consumption and suitable for recreational activities. Air pressure, while it may have indirect effects on water systems, does not provide valuable information on the water's chemical or biological state.