(b) The following definitions govern the provisions of this Subpart:

1. (1) Actual annual emissions. The actual (or estimated) emissions of a regulated air contaminant after control equipment has been applied, including fugitive emissions and emissions during startups, shutdowns, and malfunction conditions which occurred during the calendar year being reported. Actual annual emissions are based on actual operating conditions for the calendar year (i.e., actual fuel usage, actual material usage, actual operating rate) and are determined using one of the methods listed in section 202-2.4(d) of this Subpart.
2. (2) Annual process rate. An actual (or estimated) measurable parameter or quantity per calendar year that directly or indirectly relates to the emissions of an air contaminant source. Depending on the type of emission source, measurable quantity or parameter may refer to the amount of fuel combusted, raw material processed, product manufactured, or material handled or processed. The measurable quantity or parameter is typically the value that is multiplied by an emission factor to generate an emission estimate.
3. (3) Annual reportable emissions. The actual annual emissions of a facility subject to this Subpart. In addition, every three years annual reportable emissions shall include the actual annual emissions of exempt emission sources as defined in section 201-3.2 of this Title. Emissions from exempt sources are required to be reported every three years as part of the periodic emission inventory as set forth in section 202-2.3(e) of this Subpart.
4. (4) Chemical abstracts service registry number. A CAS (chemical abstracts service) registry number is a unique numeric identifier which designates only one substance and has no chemical significance other than to link information about a specific chemical substance.

5. (5) Chemical family code. A chemical family code is defined as the numerical code associated with a specific chemical family as determined in the following table:

   Chemical Family Code

   1 Particulates (PART)

   2 Sulfur Dioxide (SO₂)

   3 Nitrogen Oxides (NO_x)

   4 Volatile Organic Compounds (VOC)

   5 Carbon Monoxide (CO)

   6 Other

   7 PM-10

   8 Particulates and Hazardous Air Pollutant (HAP)

   9 VOC and HAP

   10 HAP Only

   11 PM_2.5

   12 Hydrofluorocarbons (HFCs)

   13 Perfluorocarbons (PFCs)

6. (6) Control equipment type. The type of control equipment used by a facility to regulate air emissions. The control equipment description reported on the emissions statement shall be consistent with the appropriate description contained in a list provided by the department for emission statement reporting purposes.
7. (7) Control efficiency. The effectiveness of air pollution control equipment expressed as the percentage of the actual total emissions of an air contaminant prevented by the air pollution control equipment from being emitted into the outdoor atmosphere. Control efficiency is calculated by dividing the weight of such air contaminant collected, removed, or rendered less noxious (during a specific unit of time) by the control equipment, including equipment downtime and maintenance degradation, by the uncontrolled emission rate (based on an equal unit of time) of the contaminant, and multiplying by 100 percent.
8. (8) Design capacity. A measure of the size of a point source, based on the reported maximum continuous capacity of the emission generating equipment.
9. (9) Emission factor. An average value which relates the quantity of an air contaminant released to the atmosphere as a result of an associated activity or material throughput level, usually expressed as the weight of an air contaminant divided by a unit weight, volume, distance or duration of the activity that emits the air contaminant (e.g., pounds of particulate matter emitted per ton of coal combusted).
10. (10) Emissions method code. The code which identifies how emissions were determined for emission statement reporting purposes. Emissions must be calculated using the methods described by these codes.
11. (11) Exit gas flow rate. Numerical value of stack gas flow rate (mass/time).
12. (12) Exit gas temperature. Numerical value of stack gas temperature (°C or °F).
13. (13) Exit gas velocity. Numerical value of stack gas velocity (distance/time).
14. (14) Material balance. The process of determining emissions by comparing the material inputs of a process with the amount of material outputs of the process. For example, a certain chemical of a known quantity used in a process may be emitted to the atmosphere, retained in the product, destroyed in the process, or physically removed for reprocessing or disposal.
15. (15) Maximum nameplate capacity. A measure of a unit's size which the manufacturer includes on the unit's nameplate.
16. (16) NAICS. North American Industry Classification System. NAICS is a classification of business establishments by economic activity. It was adopted by Canada, Mexico, and the United States on January 1, 1997, to replace the Standard Industrial Classification (SIC) code.
17. (17) Peak carbon monoxide season. The months of January, February and December in a given calendar year.
18. (18) Peak ozone season. The period from June 1st through August 31st, inclusive in a given calendar year.
19. (19) Percent annual throughput. The percent of the total yearly operation of a process which occurs during each of the following periods: January, February, and December; March through May; June through August; and September through November.
20. (20) SCC. Source Classification Code. A process-level code that describes the equipment and/or operation which is emitting pollutants.
21. (21) Stack diameter. The inside diameter or cross section at the exit of a stack or vent, expressed to the nearest inch.
22. (22) Stack height. The height of the stack measured from ground level to the top of the stack or vent, expressed to the nearest foot.
23. (23) Start time (hour). The hour of the day that the process equipment begins operation. This is the starting time used to calculate emission estimates for that equipment.
24. (24) Work weekday. Any day of the week excluding Saturday or Sunday.