EMISSION INVENTORY SOURCE CATEGORY

METHOD SUMMARY

These categories include 1997 estimates of total organic gases (TOG) and reactive organic gases (ROG) from consumer products. Consumer products comprise one of the largest solvent-use categories in California. As defined by the Health and Safety Code Section 41712, consumer products are any chemically formulated product used by household and institutional consumers, including but not limited to, detergents; cleaning compounds; polishes; floor finishes; cosmetics; personal care products; home, lawn, and garden products; disinfectants; sanitizers; and automotive specialty products. The definition of consumer products does not include furniture coatings or architectural coatings but does include aerosol coatings.

ACTIVITY DATA SOURCE: Three surveys provided the basis for the compilation of the latest inventory. These surveys include the ARB 1997 Consumer and Commercial Products Survey, the 1994/1995 Mid-term Measures Survey, and the 1990 U.S. EPA's Report to Congress (Survey). The Stationary Source Division (SSD) of the California Air Resources Board (ARB) conducted the Consumer and Commercial Products Survey for 1997 by sending out surveys to over 3,000 companies at the end of February 1998. The survey requested data on about 100 categories of consumer products. Based on previous efforts, the emissions are estimated to account for 70% of the entire consumer products inventory. This survey coupled with the 1997 aerosol paint survey account for 80% of the consumer products inventory. The remaining 20% of the emissions are from numerous small categories which were included in the 1990 U.S. EPA survey and the 1994/1995 Mid-term Measures Survey. SSD decided that these categories would not be included in the ARB 1997 Consumer and Commercial Products Survey, but the emissions would be estimated from the 1990 U.S. EPA survey and grown to the 1997 calendar year.

Extensive outreach efforts were made to maximize the market coverage of the 1997 Survey. The extensive outreach resulted in an estimated 90% market coverage in most categories. For categories where the coverage was determined to be low, adjustments were made by a variety of methods. These special adjustments were made in only 8 of the 100 categories surveyed. The other categories were adjusted to bring the market coverage up to 100%. The U.S. EPA, in compiling their emissions estimates for their 1990 survey, increased the sales data in most categories to account for incomplete market coverage. Data from the survey that pertain to other area source categories such as paint thinners and large-size containers of adhesives were not included in the consumer products emission inventory.

The SSD Mid-term Measures Survey was used to obtain a base line emission inventory for the Mid-term Measures regulation. The data from the Mid-term Measures survey are used for three categories: laundry detergents, hand dish soaps, and heavy-duty hand cleaner.

The categories not covered by either the Mid-term Measures Survey or the Consumer and Commercial Products Survey were taken from the 1990 U.S. EPA's Report to Congress. The emissions were grown to 1997 by the population growth ratio from 1990 to 1997. Examples of the products included in the Other Consumer Products category are arts and craft supplies, non-pesticidal veterinary and pet products, and office supplies.

EMISSION FACTOR SOURCE: To estimate the TOG emissions from the SSD survey, the 1997 California sales for each product was multiplied by the market adjustment factor for each category and then multiplied by the percent of each compound that is in the TOG definition, in that product. The fraction of reactive organic gas (FROG) values were derived from the relative amounts of reactive organic gas (ROG) compounds versus the low reactive compounds designated as "exempt" from the ROG definition. Low vapor pressure VOC (LVP-VOC) hydrocarbons are included in the ROG and TOG estimates to the greatest extent possible, based on the survey data. However, the coverage of oxygenated LVP-VOC compounds in the TOG and ROG is known to be incomplete, due to limitations and uncertainties in using the survey data from each survey. The data used for the TOG and ROG estimation were obtained from the speciation data from the surveys.

Each product TOG total was added to the category TOG total. A down-the-drain factor was applied to laundry soaps (44.78%) and hand dish soaps(12.5%) only, based on ethanol. The down-the-drain factors are applied to the emissions thus reducing the emissions because it is assumed the down-the-drain portion is not in the air. A combustion factor for charcoal lighter material is 47%, which means that only 47% of the lighter fluid is evaporated into the air.

Statewide emissions are apportioned to each county by the ratio of the county population and the statewide population.

TEMPORAL DATA: The annual activity is uniform. The daily activity occurs primarily during the daylight hours.

CHANGES IN METHOD AND EMISSION ESTIMATES: The main change in this method is that the surveys that are used are more comprehensive than past surveys. A significant amount of effort went into assuring that the quality of the data truly represented the consumer products market in California. The 1997 emission estimates are larger than the 1987 estimates due to a more comprehensive survey which captured the consumer products sold in California.

DATE OF THE LAST UPDATE: April 2000

GROWTH PARAMETER: Consumer products are assigned a default growth parameter of population from the Department of Finance (DOF). Aerosol coatings are assigned a default of DOF population for the years 1970 - 1990 and then flat from 1990 on.

STATEWIDE EMISSIONS SUMMARY (1997 - ANNUAL AVERAGE TONS/DAY)

CES No.	TOG	CO	NOX	SOX	PM
Aerosol Coatings (15 codes)	29.51	0.00	0.00	0.00	0.00
Consumer Products (120 codes)	292.89	0.00	0.00	0.00	0.00
Total	322.40	0.00	0.00	0.00	0.00

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This page last revised on November 11, 2003

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