Environmental site remediation deals with the removal of pollution or contaminants from soil, groundwater, sediment, or surface water. It includes systematic steps involving detection, investigation and hazard assessments of suspected contaminated sites. Remedial activities are designed to reverse toxic changes in soil and water, eliminate site pollution, and protect sensitive receptors, such as people, environment and ecology. Air quality is an important environmental media which acts as an ecological pathway for contaminants to reach receptors. Air monitoring at remediation sites is used to detect and mitigate nuisance dust and toxic contaminants emitted during remedial works including dust particles, aerosols, odors, vapors and heavy metals.