# How do you calculate NOx emission factor?

## How do you calculate NOx emission factor?

Usually, you can assume full year operation for emission calculation purposes (8760 hours per year.) So, the unit burns 0.05 tons of waste per hour. Multiply this by the emission factor of 3 lb NOx per ton of waste. 0.05 ton/hr x 3 lb/ton = 0.15 lb NOx/hr.

### What percentage of the emissions are produced from the crankcase of an uncontrolled vehicle?

In gasoline- fueled engines, however, 20 to 25 percent of the total hydrocarbon emissions from uncontrolled engines come from crankcase blowby and another 10 to 15 percent from evaporation of the fuel in the storage tank and the carburetor.

#### How do you calculate gas emissions?

Calculate the emission rate by using this method: Mass Emission rate (lb/hr) = Emission factor (lb/unit) x capacity (unit/hr)

How is CO2 intensity calculated?

Note: The CO2 emission intensity (g CO2/kWh) is calculated as the ratio of CO2 emissions from public electricity production (as a share of CO2 emissions from public electricity and heat production related to electricity production), and gross electricity production.

How are the emission factors in AP-42 compiled?

The emission factors have been developed and compiled from source test data, material balance studies, and engineering estimates. The Fifth Edition of AP-42 was published in January 1995. Since then EPA has published supplements and updates to the fifteen chapters available in Volume I, Stationary Point and Area Sources.

## How is the emission factor developed?

Emission factor is developed primarily from A or B rated test data from a moderate number of facilities. Although no specific bias is evident, is not clear if the facilities tested represent a random sample of the industry. As with the A rating, the source category population is sufficiently specific to minimize variability. C = Average.

### Are there any sections of AP-42 that have not been completed?

There Are Many Sections Of AP-42 That Have Not Been Completed. The Description Of Their Status Was Recently Changed From “WORK IN PROGRESS,” or “WORK SUSPENDED – AT THIS TIME, THERE ARE NO PLANS TO UPDATE THIS SECTION” to “THIS IS A PLACEHOLDER HEADING SHOULD EPA DETERMINE AT SOME FUTURE DATE THAT DEVELOPMENT OF A SECTION IS WARRANTED.”

#### When did the emissions factors change in the 2008 report?

This information was updated April 11, 2008 to include process information. None of the emissions factors were changed. Contact Us to ask a question, provide feedback, or report a problem.