A situation where air enters the filter media. Air is harmful to both the filtration and backwash processes. Air can prevent the passage of water during the filtration process and can cause the loss of filter media during the backwash process.
An open vertical drop, or vertical empty space, that separates a drinking (potable) water supply to be protected from another water system in a water treatment plant or other location. This open gap prevents the contamination of drinking water by back siphonage or backflow because there is no way raw water or any other water […]
Pumping of compressed air into the soil to move water in the unsaturated zone down to the saturated zone.
A designated air space over a designated piece of land. As with surface property, an air lot may be transferred.
Substances in the air that could, at high enough concentrations, harm human beings, animals, vegetation, or material. Air pollutants may thus include forms of matter of almost any natural or artificial composition capable of being airborne. They may consist of solid particles, liquid droplets, or combinations of these.
Degradation of air quality with negative effects on human health or the natural or built environment due to the introduction, by natural processes or human activity, into the atmosphere of substances (gases, aerosols) which have a direct (primary pollutants) or indirect (secondary pollutants) harmful effect. See also Aerosol and Short-lived climate forcers (SLCF).
Protects and enhances public health and the environment of Arizona by controlling present and future sources of air pollution. Core responsibilities include collecting and analyzing quality assured and precise ambient air monitoring data; preparing pollution forecasts to help people limit their exposure to air pollution and air pollution sources; conducting and collaborating on research and […]
An index for reporting daily air quality. It determines how clean or polluted air is and what associated health effects might be of concern. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air. EPA calculates the AQI for five major air pollutants regulated by the […]
The level of pollutants prescribed by regulations that are not to be exceeded during a given time in a defined area.
An in-situ treatment technology that uses injected air to help remove harmful vapors from polluted soil and groundwater below the water table by injecting air directly into the saturated subsurface to encourage the solvents and gasoline to evaporate faster, which makes them easier to remove with a vacuum.
