A method for correcting for ambient air exposure during vacuum decay leak detection testing comprising: measuring a first time interval immediately preceding a first test cycle of vacuum decay leak detection testing, the first time interval being a time in which a testing chamber containing a package is not under vacuum or low pressure conditions, performing the first test cycle of vacuum decay leak detection on the package, collecting raw pressure data from the first test cycle, using the measured first time interval to convert the raw pressure data to corrected pressure data to remove interference from the raw pressure data, using a second time interval immediately preceding a second testing cycle which immediately precedes the first test cycle in combination with the first time interval to further remove interference from the raw pressure data, wherein an algorithm is used to convert the measured pressure data into corrected pressure data based on the first measured time interval, and wherein the algorithm is dP Corrected = dP Measured - K dP ∗ Ln ( DT History / 10 ), wherein DT History is a weighted variable that factors the first exposure time interval that occurred immediately before a current test, DT Current , and at least the second exposure time interval that occurred before a test previous to the current test, DT Previous , and wherein DT History = DT Current ∗ K History + DT Previous ∗ ( 1 - K History ), and where dP Corrected is a corrected pressure data value, dP Measured is a measured raw pressure value collected during the current test cycle before correcting for ambient air exposure in the testing chamber, K dP is an empirical correction constant, K History is an empirical constant, and using the corrected pressure data to determine if a leak is present in the package. measuring a first time interval immediately preceding a first test cycle of vacuum decay leak detection testing, the first time interval being a time in which a testing chamber containing a package is not under vacuum or low pressure conditions, performing the first test cycle of vacuum decay leak detection on the package, collecting raw pressure data from the first test cycle, using the measured first time interval to convert the raw pressure data to corrected pressure data to remove interference from the raw pressure data, using a second time interval immediately preceding a second testing cycle which immediately precedes the first test cycle in combination with the first time interval to further remove interference from the raw pressure data, wherein an algorithm is used to convert the measured pressure data into corrected pressure data based on the first measured time interval, and wherein the algorithm is dP Corrected = dP Measured - K dP ∗ Ln ( DT History / 10 ), wherein DT History is a weighted variable that factors the first exposure time interval that occurred immediately before a current test, DT Current , and at least the second exposure time interval that occurred before a test previous to the current test, DT Previous , and wherein DT History = DT Current ∗ K History + DT Previous ∗ ( 1 - K History ), and where dP Corrected is a corrected pressure data value, dP Measured is a measured raw pressure value collected during the current test cycle before correcting for ambient air exposure in the testing chamber, K dP is an empirical correction constant, K History is an empirical constant, and using the corrected pressure data to determine if a leak is present in the package. <EOS>