The following compounds are exempt from the definition of Reactive Organic Gases (ROG) per District Rule 1.1. (as amended 6/3/2024):

Table I. Negligibly Photochemically-Reactive Organic Compounds

Compound, CAS

1,1,1 trichloroethane (methyl chloroform), 71-55-6

methane, 74-82-8

methylene chloride (dichloromethane), 75-09-2

difluoromethane (HFC-32), 75-10-5

1,1-difluoroethane (HFC-152a), 75-37-6

chlorodifluoromethane (HCFC-22), 75-45-6

trifluoroethane (HFC-23), 75-46-7

1-chloro-1, 1-difluoroethane (HCFC-142b), 75-68-3

trichlorofluoromethane (CFC-11), 75-69-4

dichlorodifluoromethane (CFC-12), 75-71-8

1,1,2-trichloro-1,2,2-tetrafluoroethane (CFC-113), 76-13-1

1,2-dichloro-1,1,2,2-tetrafluoroethane (CFC-114), 76-14-2

chloropentafluoroethane (CFC-115), 76-15-3

methylformate (HCOOCH3), 107-31-3

propylene carbonate, 108-32-7

1,1,1-trifluoro-2,2-dichloroethane (HCFC-123), 306-83-2

fluoroethane (ethyl fluoride, HFC-161), 353-36-6

1,2-dichloro-1,1,2-trifluoroethane (HCFC-123a), 354-23-4

pentafluoroethane (HFC-125), 354-33-6

1,1,2,2-tetrafluoroethane (HFC-134), 359-35-3

1,1,1,2,2,3,3-heptafluoro-3-methoxypropane (n-C3F7OCH3 r HFE-7000), 375-03-1

1,1,1,3,3-pentafluorobutane (HFC-365mfc), 406-58-6

1,1,2,2-tetrafluoro-1-(2,2,2-tetrafluoroethoxy) ethane (HFE-347pcf2), 406-78-0

1,1,1-trifluoroethane (HFC-143a), 420-46-2

3,3-dichloro-1,1,1,2,2-pentafluoropropane (HCFC-225ca), 422-56-0

1,1,1,2,3-pentafluoropropane (HFC-245eb), 431-31-2

1,1,1,2,3,3-hexafluoropropane (HFC-236ea), 431-63-0

1,1,1,2,3,3,3-heptafluoroprpoane (HFC-227ea), 431-89-0

1,1,1,3,3-pentafluoropropane (HFC-245fa), 460-73-1

1,3-dichloro-1,1,2,2,3-pentafluoropropane (HCFC-225cb), 507-55-1

t-butyl acetate (TBAC), 540-88-5

chlorofluoromethane (HCFC-31), 593-70-4

dimethyl carbonate, 616-38-6

1,1,2,2,3-pentafluoropropane (HFC-245ca), 679-86-7

1,1,1,3,3,3-hexafluoropropane (HFC-236fa), 690-39-1

2,3,3,3-tetrafluoropropene (HFO-1234yf), 754-12-1

1,1,1,2-tetrafluoroethane (HFC-134a), 811-97-2

1-chloro-1-fluoroethane (HCFC-1511), 1615-75-4

1,1-dichloro-1,1,1,2-tetrafluoroethane (HCFC-141b), 1717-00-6

2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124), 2837-89-0

1,1,2,3,3-pentafluoropropane (HFC-245ea), 24270-66-4

trans-1,3,3,3-tetrafluoropropene (HFO-1234ze), 29118-24-9

trans-1,1,1,4,4,4-hexafluorobut-2-ene (HFO-1336mzz-E), 66711-86-2

trans-1-chloro-3,3,3-trifluoro-1-ene (Solstice 1233zd €), 102687-65-0

 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methyoxy-4-trifluoromethyl-pentane (HFE-7300), 132182-92-4

1,1,1,2,2,3,4,4,5,5-decafluoropentane (HFC-43-10mee), 138495-42-8

1-thoxy-1,1,2,2,3,3,4,4,4-nonafluorobutane (C4F9OC2H5 or HFE-7200), 163702-05-4

2-(ethoxydifluoromethyl)-1,1,1,2,3,3,3-heptafluoropropane ((CF3)2CFCF2OCH3), 163702-06-5

1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxybutane (C4F9OCH3 or HFE-7100), 163702-07-6

2-(difluoromethoxymethyl)-1,1,1,2,3,3,3-heptafluoromethyl)hexane (HFE-7500), 297730-93-9

2-amino-2-methyl-1-propanol (AMP)

Four classes of perfluorocarbon (PFC) compounds:

Cyclic, branched, or linear, completely fluorinated alkanes

Cyclic, branched, or linear, completely fluorinated ethers with no unsaturations

Cyclic, branched, or linear, completely fluorinated tertiary amines with no unsaturations

Sulfur containing perfluorocarbons with no unsaturations and with sulfur bonds only to carbon and fluorine

Group of Four Hydrofluoropolyethers (HRPEs):

HCF2OCF2H (HFE 134)

HCF2OCF2OCF2H (HFE-236cal2)

HCF2OCF2CF2OCF2H (HFE-338pcc13)

HCF2OCF2OCF2CF2OCF2H (H-Galden 1040X and H-Galden ZT130 (or 150 or 180))

acetone, 67-64-1

ethane, 74-84-0

methyl acetate, 79-20-9

1-chloro-4-trifluoromethyl benzene (parachlorobenzotrifluoride, PCBTF), 98-56-6

perchloroethylene (tetrachloroethylene), 127-48-4

Cis-1,1,1,4,4,4-hexafluorobut-2-ene (HFO-1336mzz-Z), 692-49-9