... pro-duce lower levels of SO emissions due to the2 formation of sulfuric acid. Emission factors for SO are contained in tables 3- 3, 3- 4, 3- 5, and x 3- 6.(2) Nitrogen oxide emissions. The level of ... black, white,xthe only ones. Therefore, while the emission brown, blue, and sometimes yellow, depending on thefactors presented in tables 3- 3, 3- 4, 3- 5, and 3- conditions under which certain ... conditions which affect particulateemissions are shown in table 3- 2. Particulate emissionfactors are presented in tables 3- 3, 3- 4, 3- 5 and 3- 6.b. Gaseous emissions.(1) Sulfur oxide emissions. During...