****!!!!**** {Summary with well-divided reference sections} View osha standards for chlorine dioxide in WISER. "Vacated 1989 OSHA PEL TWA 0.1 ppm (0.3 mg/cu m); STEL 0.3 ppm (0.9 mg/cu m) is still enforced in some states."

{OSHA definition of "working life" number of years for chronic exposure limits} "The OSH Act requires OSHA to set the standard that most adequately protects employees against harmful workplace exposures for the period of their ‘‘working life’’ (29 U.S.C. 655(b)(5)). OSHA’s longstanding policy is to define ‘‘working life’’ as constituting 45 years; thus, it assumes 45 years of exposure when evaluating the risk of material impairment to health caused by a toxic or hazardous substance."

{Safety standards for inhaled air} "TLV-TWA guidelines that are levels that should not be exceeded during any 8-hour workday of a 40- hour workweek" "TLV-STEL guidelines which are 15-minute exposure levels that should not be exceeded during a workday."

****!!!!****!!!!**** {510(k) exemptions for COVID.} "FDA considers chemical/physical disinfectant devices to encompass chemical disinfectant solutions used to disinfect medical devices." "Medical devices disinfectors... exempt from premarket review." "during the declared public health emergency, FDA does not intend to object to the distribution and use of sterilizers, disinfectant devices, and air purifiers that are intended to be effective at killing the SARS-CoV-2 virus but do not already have FDA marketing authorization, without compliance with the following regulatory requirements where such devices do not create an undue risk in light of the public health emergency: prior submission of a premarket notification under section 510(k) [and some other requirements]. FDA believes such devices will not create such an undue risk where the performance and labeling elements... are met." "If the device generates ozone, FDA recommends that the manufacturer evaluate whether the product is within the maximum acceptable level of ozone given in 21 CFR 801.415." [****It sounds like chlorine dioxide could be used if stays below regulated air levels. FDA has endorsed ClO2 standards for air related to food processing [ but need to check FDA's approved air concentrations for around people]. EPA has approved safety of air concentrations at specific levels around people.****]

{"Nonfood Uses" lists include: "Air treatments" and "HVAC Systems & Humidifiers" in Residential and Public Access Premises; Air Treatments, Critical & Noncritical Items, Hospitals/Medical Institutions (HumanVeterinary nonfood handling areas); Industrial Processes & Water Systems--AC/Refrigeration Condensate, Commercial/Indust Cooling Water, Evaporative Condensor, HVAC, Air Washer} Direct, indirect & non-food uses. Irrigation systems (food crops), egg washing treatment, fruit & vegetable treatments, Commercial, Institutional & Industrial Premises and Equip, Medical Premises and Equipment (inc Air), human drinking water, preservatives for growing or harvested crops, Industrial Processes and Water Systems, Antifoulant Paints and Coatings, Wood Preservatives, Swimming Pools and Spas, Aquatic Areas