40 CFR 60.6495: How do I convert my 1-hour arithmetic averages into appropriate averaging times and units?

(a) Use equation 1 in § 60.6680(a) to calculate emissions at 7 percent oxygen.

(b) Use the test methods in Table 4 to Subpart WWWW to calculate the 24-hr daily geometric average concentrations and percent reductions of sulfur dioxide emissions and the 24-hr daily arithmetic average for concentrations of nitrogen oxides.

(c) Calculate the 4-hour block or 24-hour daily arithmetic averages specified in Table 2 to Subpart WWWW (as applicable) from 1-hour arithmetic averages expressed in parts per million by volume corrected to 7 percent oxygen (dry basis) for concentrations of carbon monoxide. CEMS data during warmup, startup, and shutdown, as defined in this subpart, are not corrected to 7 percent oxygen, and are used as measured.

(d) If you elect to continuously monitor emissions of particulate matter, mercury, cadmium, lead, or hydrogen chloride, use EPA Reference Method 19, section 12.4.1, in appendix A of this part, to calculate a 24-hour daily block arithmetic average for emission concentrations.