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Terms starting with H
Definition
Also called air toxics. Air pollutants that are known or expected to cause cancer or other serious health effects, such as reproductive effects or birth defects, or adverse environmental and ecological effects. Examples of toxic air pollutants include benzene (found in gasoline), perchloroethylene (emitted from some dry-cleaning facilities), and methylene chloride (used as a solvent by a number of industries). Example of other listed air toxics include dioxin, asbestos, toluene, and metals such as cadmium, mercury, chromium, and lead compounds.
Definition
An area of localized, increased pollutant concentrations (e.g., a congested roadway intersection).
Definition
Relative humidity compensation means that the sensor’s measurements are adjusted to account for changes in humidity levels in the sensor’s environment. Humidity can influence how certain gases interact with the sensor’s surface, affecting its response. Compensation involves incorporating humidity sensors into the sensor system, monitoring humidity levels, and applying correction algorithms to account for humidity-induced variations in the sensor’s output.
Definition
HVAC stands for “Heating, Ventilation, and Air Conditioning.” It refers to the systems and technology used to control indoor climate, maintain air quality, and provide thermal comfort in buildings, homes, vehicles, and various other enclosed spaces. HVAC systems are designed to manage temperature, humidity, air circulation, and air cleanliness to create a comfortable and healthy indoor environment.
Definition
High Volume Air Samplers (HVS) are traditional manually operated units that are used to collect air pollutants like dust particles and gases by maintaining constant airflow from the instruments, usually for 24 hours. The samples taken from this approach are grab samples, and they are taken at fixed intervals.
Definition
A hybrid network of air quality monitors consisting; of traditional ambient air quality monitors as reference stations along with sensor-based monitors as spatially dense data generation points, is the future of urban air quality monitoring. The following benefits of hybrid air quality networks make them cost-effective, high-quality air quality monitoring approaches.
Definition
H2S is colorless, flammable, poisonous, and corrosive gas with one sulfur atom bonded to two hydrogen atoms. Also, known as sewer gas, swamp gas, or manure gas. H2S has a noticeable rotten-egg odour detectable at concentrations as low as 0.5 ppb. Also, It is a highly flammable, explosive gas between 4% and 45% (concentration in air) which may travel to ignition sources and flash back. When ignited, it burns to produce toxic vapors and gases (sulfur oxides).
Definition
Hyperlocal air monitoring refers to the practice of monitoring air quality at a very localized and granular level, typically in specific neighborhoods, streets, or even individual buildings or facilities. This approach aims to provide detailed and real-time information about air pollution and other air quality parameters in small geographic areas.
