Photochemical oxidants definition

Photochemical oxidants means an air pollutant, which is formed by the action of sunlight on oxides of nitrogen and hydrocarbons.
Photochemical oxidants means substances produced in the atmosphere where as a result of exposure of certain active chemical compounds, principally the hydrocarbons and nitrogen oxides, to sunlight. For the purpose of these standards, the photochemical oxidants shall include the ozone, peroxyacyl nitrates, organic peroxides and other oxidants which contribute to the increase of oxidants concentration as measured by the method specified in paragraph C of Article 11.

Examples of Photochemical oxidants in a sentence

  • Photochemical oxidants are species that are formed during the photo-atmospheric oxidation of the VOCs and examples of these include ozone, hydrogen peroxide and acyl peroxy nitrates [33] .

  • These pollutants are as follows:• Carbon monoxide (CO);• Oxides of Nitrogen (NOx, including Nitrogen Dioxide (NO2);• Photochemical oxidants, including ozone (O3);• Particulate matter (PM10 and PM2.5); and,• Volatile Organic Compounds (VOC), including benzene and 1,3-butadiene.Concentrations of VOC and O3 are generally not measured in the environment as their ambient concentrations are difficult and expensive to measure.

  • Photochemical oxidants will convert some SO2 to sulfate thereby reducing SO2 concentrations.

  • Section 52.777 is amended by adding paragraph (ff) to read as follows:§ 52.777 Control strategy: Photochemical oxidants (hydrocarbons).

  • No.: TRANSL 34591 Photochemical oxidants injury in rice plants III effect of ozone on physiological activities in rice plants = Kokagaku okishidanto ni yoru ine no higai ni tsuite..

  • Photochemical oxidants cause pho- tochemical smog that irritates the eyes and throats or influ- ences the respiratory organs, however, the level of photo- chemical oxidants still exceeds the environmental standard in almost all the areas nationwide.

  • Photochemical oxidants are produced when nitrogen oxides and hydrocarbons emitted from factories or cars react to the sun’s ultraviolet rays.

  • Photochemical oxidants, which must be assessed regularly (short-term assessment) at proper assessment times (05:00 - 20:00 hrs), were 0.1% - 7.2% at each measurement station.√ Roadside :Levels of NO2 were within the environmental standard at three of the five measurement stations while CO levels were within the environmental standard at every measurement station.

  • Photochemical oxidants including H2O2 and O3 exhibited a decreasing trend with the increase of PM mass because of the significantly reduced solar ultraviolet (UV)85 radiation intensity due to the aerosol dimming effect.

  • Photochemical oxidants (ozone)7 and PM 8 are formed in part by reactions of NOX emissions with other pollutants in the atmosphere.

Related to Photochemical oxidants

  • Biological agent shall mean any pathogenic (disease producing) micro-organism(s) and/or biologically produced toxin(s) (including genetically modified organisms and chemically synthesized toxins) which cause illness and/or death in humans, animals or plants.

  • Biological Samples means any physical samples obtained from Study Participants in accordance with the Protocol for the purposes of the Study.

  • Cannabinoid edible means food or potable liquid into which a cannabinoid concentrate, cannabinoid extract or dried marijuana leaves or flowers have been incorporated.

  • Cannabinoid means any of the chemical compounds that are the active constituents of marijuana.

  • Chemical agent shall mean any compound which, when suitably disseminated, produces incapacitating, damaging or lethal effects on people, animals, plants or material property.

  • Radionuclide means a radioactive element or a radioactive isotope.

  • Nitrogen oxides means nitric oxide and nitrogen dioxide, expressed as nitrogen dioxide (NO2);

  • Electrostatic spray means a method of applying a spray coating in which opposite electric charges are applied to the substrate and the coating. The coating is attracted to the substrate by the electrostatic potential between them.

  • Anaerobic digester means a liquid manure storage area that is constructed with the intent to capture and combust gas emissions resulting from the digestion of waste by microbes in anaerobic conditions. An anaerobic digester is a LMSA and is required to comply with all requirements applicable to LMSAs. Requirements specific to anaerobic digesters will be noted when applicable.

  • Microorganisms (1 2) means bacteria, viruses, mycoplasms, rickettsiae, chlamydiae or fungi, whether natural, enhanced or modified, either in the form of "isolated live cultures" or as material including living material which has been deliberately inoculated or contaminated with such cultures.

  • Halogen means one of the chemical elements chlorine, bromine or iodine.

  • Tetrahydrocannabinol means the same as that term is defined in § 3.2-4112.

  • Fluoroscopic imaging assembly means a subsystem in which X-ray photons produce a visual image. It includes the image receptor(s) such as the image intensifier and spot-film device, electrical interlocks, if any, and structural material providing linkage between the image receptor and diagnostic source assembly.

  • Bioassay means the determination of kinds, quantities or concentrations and, in some cases, the locations of radioactive material in the human body, whether by direct measurement, in vivo counting, or by analysis and evaluation of materials excreted or removed from the human body. For purposes of these rules, “radiobioassay” is an equivalent term.

  • Corrosion inhibitor means a substance capable of reducing the corrosivity of water toward metal plumbing materials, especially lead and copper, by forming a protective film on the interior surface of those materials.

  • Assay means a laboratory analysis of Crude Petroleum to include the following: A.P.I. Gravity, Reid vapor pressure, composition, pour point, water and sediment content, sulfur content, viscosity, distillation, hydrogen sulfide, flash/boiling point and other characteristics as may be required by Carrier.

  • Pathogen means an organism that is capable of producing an infection or disease in a susceptible host.

  • High global warming potential hydrofluorocarbons means any hydrofluorocarbons in a particular end use for which EPA’s Significant New Alternatives Policy (SNAP) program has identified other acceptable alternatives that have lower global warming potential. The SNAP list of alternatives is found at 40 CFR Part 82 subpart G with supplemental tables of alternatives available at (http://www.epa.gov/snap/).

  • Pyrolysis means the thermal degradation of a substance in the absence of any oxidising agent, which does not form part of the substance itself, to produce char and gas and/or liquid; and

  • Receptor means enclosed spaces, conduits, protected groundwater sources, drinking and non-drinking water wells, surface water bodies, and public water systems which when impacted by chemicals of concern may result in exposure to humans and aquatic life, explosive conditions or other adverse effects on health, safety and the environment as specified in these rules.

  • Biological product means a virus, therapeutic serum, toxin, antitoxin, vaccine, blood, blood component or derivative, allergenic product, protein other than a chemically synthesized polypeptide, or analogous product, or arsphenamine or any derivative of arsphenamine or any other trivalent organic arsenic compound, applicable to the prevention, treatment, or cure of a disease or condition of human beings.

  • Vaccine means a specially prepared antigen which, upon administration to a person, will result in immunity and, specifically for the purposes of this rule, shall mean influenza and pneumococcal vaccines.

  • Compounds means any or all of the following chemicals, as the context requires:

  • Tissue means a portion of the human body other than an organ or an eye. The term does not include blood unless the blood is donated for the purpose of research or education.

  • Biological diversity means the variability among living organisms from all sources including, inter alia, terrestrial, marine and other aquatic ecosystems and the ecological complexes of which they are part; this includes diversity within species, between species and of ecosystems.

  • Perfluoroalkyl and polyfluoroalkyl substances or “PFAS” means a class of fluorinated organic chemicals containing at least one fully fluorinated carbon atom.