“Fluorides” means any matter containing the element fluorine in a combined form. Ambient air quality standards for fluorides are those concentrations in the ambient air or in other substances which result in the following values being exceeded: Field Crops. Field crops at any stage or growth may not exceed 35 micrograms F per gram dry tissue in washed samples. Forage. Running averages of 12 monthly samples of forage or hay or silage grown in the area as feed may not exceed 35 micrograms F per gram dry tissue in unwashed samples. The average of any 2 consecutive months' samples of forage or hay or silage grown in the area as feed may not exceed 60 micrograms F per gram dry tissue in unwashed samples. A monthly sample of forage or hay or silage grown in the area as feed may not exceed 80 micrograms F per gram dry tissue in unwashed samples. Fruit Trees, Berries, and Other Commercial Crops. Fully expanded functional leaves may not exceed 50 micrograms F per gram dry tissue in washed samples. Deciduous Trees and Shrubs. Fully expanded functional leaves may not exceed 100 micrograms F per gram dry tissue in washed samples. Conifers and Evergreen Trees and Shrubs. Fully expanded leaves or needles of the current year may not exceed 50 micrograms F per gram dry tissue in washed samples. Leaves and needles of prior seasons may not exceed 75 micrograms F per gram dry tissue in washed samples. Grasses and Herbs. Grasses and herbs not subject to browsing, grazing, or harvest for use in feeds or food may not exceed 150 micrograms F per gram dry tissue in washed samples. Ornamental Planting. Ornamental plants, except trees, shrubs, and turf where §B(4)—(7) applies, may not exceed 40 micrograms F per gram dry tissue in fully expanded leaves in washed samples at any period during the growing season. Other Values. If it considers vegetation sampling to be not practicable, the Department may assume unsatisfactory conditions exist when either: Static limed filter paper samples of 28 to 32 days exposure exceed 2 micrograms F per 100 square centimeters per day for a yearly average of monthly samples; or Gaseous fluorides exceed 1.2 micrograms F per cubic meter of air in any 24 hour sample or any 72 hour average exceeds 0.4 microgram F per cubic meter of air. Monitoring and Measurement of Fluoride. The methodologies to be used for the monitoring and measurement of fluoride shall be those specified in Method 1005 of the Department's Technical Memorandum 91-01, “Test Methods and Equipment Specifications for Stationary Sources” (January 1991), which is incorporated by reference in COMAR 26.11.01.04C. For the purposes of this chapter, the ambient air quality standards, definitions, reference conditions, and methods of measurement are those specified in 40 CFR Parts 50, 51, 53, and 58, as amended. Environment Article, §§1-101, 1-404, 2-101—2-103, 2-301—2-303, 10-102, and 10-103, Annotated Code of Maryland Effective date: July 18, 1980 (7:12 Md. R. 1148) Regulation .01 amended effective January 18, 1982 (8:25 Md. R. 1995) Regulation .01B amended effective July 2, 1985 (12:11 Md. R. 1050) For the history of this subtitle before June 18, 1980, see the Administrative History of COMAR 26.11.01. Chapter recodified from COMAR 10.18.04 to COMAR 26.11.04 Regulation .01C amended effective February 17, 1992 (19:3 Md. R. 306) Regulation .01 amended, Regulation .02 adopted, and Regulations .01—.07 under COMAR 26.11.03 recodified as Regulations .03—.09 under COMAR 26.11.04 Ambient Air Quality Standards effective May 8, 1995 (22:9 Md. R. 648) The following is a history of Regulations .03—.09 before May 8, 1995, as codified under COMAR 26.11.03.01—.07: Regulation .01 amended effective October 14, 1985 (12:18 Md. R. 1766) Regulation .04 amended effective January 5, 1988 (14:24 Md. R. 2555) Regulation .08 repealed effective October 14, 1985 (12:18 Md. R. 1766) Chapter recodified from COMAR 10.18.03 to COMAR 26.11.03 Regulation .01 amended effective March 21, 1989 (16:3 Md. R. 347) Regulation .02 amended effective March 21, 1989 (16:3 Md. R. 347) Regulation .03 amended effective February 28, 2005 (32:4 Md. R. 411) Regulation .04 amended effective February 28, 2005 (32:4 Md. R. 411) Regulation .05 amended effective February 28, 2005 (32:4 Md. R. 411) Regulation .07 amended effective February 28, 2005 (32:4 Md. R. 411) Regulation .08 amended effective February 28, 2005 (32:4 Md. R. 411) Chapter revised effective September 17, 2012 (39:18 Md. R. 1197)