Qualifiers

November 28, 2022

AQS Reference Table

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This table has a "Still Active" column. If this code can be used to submit new data, this is set to YES. If this code is no longer allowed on new data, but the code may be attached to older data, it is set to NO.

Qualifier Code Qualifier Description Qualifier Type Qaulifier Type Code Still Active Legacy Code
RA African Dust. Request Exclusion REQEXC YES
RB Asian Dust. Request Exclusion REQEXC YES
RC Chemical Spills & Industrial Accidents. Request Exclusion REQEXC YES
RD Cleanup After a Major Disaster. Request Exclusion REQEXC YES
RE Demolition. Request Exclusion REQEXC YES
RF Fire - Canadian. Request Exclusion REQEXC YES
RG Fire - Mexico/Central America. Request Exclusion REQEXC YES
RH Fireworks. Request Exclusion REQEXC YES
RI High Pollen Count. Request Exclusion REQEXC YES
RJ High Winds. Request Exclusion REQEXC YES
RK Infrequent Large Gatherings. Request Exclusion REQEXC YES
RL Other. Request Exclusion REQEXC YES
RM Prescribed Fire. Request Exclusion REQEXC YES
RN Seismic Activity. Request Exclusion REQEXC YES
RO Stratospheric Ozone Intrusion. Request Exclusion REQEXC YES
RP Structural Fire. Request Exclusion REQEXC YES
RQ Terrorist Act. Request Exclusion REQEXC YES
RR Unique Traffic Disruption. Request Exclusion REQEXC YES
RS Volcanic Eruptions. Request Exclusion REQEXC YES
RT Wildfire-U. S. Request Exclusion REQEXC YES
1 Deviation from a CFR/Critical Criteria Requirement. Quality Assurance Qualifier QA YES
1V Data reviewed and validated. Quality Assurance Qualifier QA YES
2 Operational Deviation. Quality Assurance Qualifier QA YES
3 Field Issue. Quality Assurance Qualifier QA YES
4 Lab Issue. Quality Assurance Qualifier QA YES
5 Outlier. Quality Assurance Qualifier QA YES
6 QAPP Issue. Quality Assurance Qualifier QA YES
7 Below Lowest Calibration Level. Quality Assurance Qualifier QA YES
9 Negative value detected - zero reported. Quality Assurance Qualifier QA YES
CB Values have been Blank Corrected. Quality Assurance Qualifier QA YES
CC Clean Canister Residue. Quality Assurance Qualifier QA YES
CF Canister Bias: NATTS/UATMP Data for compounds that have failed certification for the canister. Quality Assurance Qualifier QA YES
CL Surrogate Recoveries Outside Control Limits. Quality Assurance Qualifier QA YES
DI Sample was diluted for analysis. Quality Assurance Qualifier QA YES
DN DNPH peak less than NATTS TAD requirement, reported value should be considered an estimate. Quality Assurance Qualifier QA YES
EH Estimated; Exceeds Upper Range. Quality Assurance Qualifier QA YES
FB Field Blank Value Above Acceptable Limit. Quality Assurance Qualifier QA YES
FX Filter Integrity Issue. Quality Assurance Qualifier QA YES
HT Sample pick-up hold time exceeded. Quality Assurance Qualifier QA YES
LB Lab blank value above acceptable limit. Quality Assurance Qualifier QA YES
LJ Identification Of Analyte Is Acceptable; Reported Value Is An Estimate. Quality Assurance Qualifier QA YES
LK Analyte Identified; Reported Value May Be Biased High. Quality Assurance Qualifier QA YES
LL Analyte Identified; Reported Value May Be Biased Low. Quality Assurance Qualifier QA YES
MD Value less than MDL. Quality Assurance Qualifier QA YES
MS Value reported is 1/2 MDL substituted. Quality Assurance Qualifier QA YES
MX Matrix Effect. Quality Assurance Qualifier QA YES
ND No Value Detected, Zero Reported. Quality Assurance Qualifier QA YES
NS Influenced by nearby source. Quality Assurance Qualifier QA YES
QP Pressure Sensor Questionable. Quality Assurance Qualifier QA YES
QT Temperature Sensor Questionable. Quality Assurance Qualifier QA YES
QX Does not meet QC criteria. Quality Assurance Qualifier QA YES
SB Sampler Bias: NATTS/UATMP Data for compounds that have failed certification for the sampler. Quality Assurance Qualifier QA YES
SP NATTS/UATMP data with Spike Recovery outside acceptance limits. Quality Assurance Qualifier QA YES
SQ Values Between SQL and MDL. Quality Assurance Qualifier QA YES
SS Value substituted from secondary monitor. Quality Assurance Qualifier QA YES
SX Does Not Meet Siting Criteria. Quality Assurance Qualifier QA YES
TB Trip Blank Value Above Acceptable Limit. Quality Assurance Qualifier QA YES
TT Transport Temperaure is Out of Specs. Quality Assurance Qualifier QA YES
V Validated Value. Quality Assurance Qualifier QA YES
VB Value below normal; no reason to invalidate. Quality Assurance Qualifier QA YES
W Flow Rate Average out of Spec. Quality Assurance Qualifier QA YES
X Filter Temperature Difference or Average out of Spec. Quality Assurance Qualifier QA YES
Y Elapsed Sample Time out of Spec. Quality Assurance Qualifier QA YES
AA Sample Pressure out of Limits. Null Data Qualifier NULL YES 9967
AB Technician Unavaliable. Null Data Qualifier NULL YES 9968
AC Construction/Repairs in Area. Null Data Qualifier NULL YES 9969
AD Shelter Storm Damage. Null Data Qualifier NULL YES 9970
AE Shelter Temperature Outside Limits. Null Data Qualifier NULL YES 9971
AF Scheduled but not Collected. Null Data Qualifier NULL YES 9972
AG Sample Time out of Limits. Null Data Qualifier NULL YES 9973
AH Sample Flow Rate or CV out of Limits. Null Data Qualifier NULL YES 9974
AI Insufficient Data (cannot calculate). Null Data Qualifier NULL YES 9975
AJ Filter Damage. Null Data Qualifier NULL YES 9976
AK Filter Leak. Null Data Qualifier NULL YES 9977
AL Voided by Operator. Null Data Qualifier NULL YES 9978
AM Miscellaneous Void. Null Data Qualifier NULL YES 9979
AN Machine Malfunction. Null Data Qualifier NULL YES 9980
AO Bad Weather. Null Data Qualifier NULL YES 9981
AP Vandalism. Null Data Qualifier NULL YES 9982
AQ Collection Error. Null Data Qualifier NULL YES 9983
AR Lab Error. Null Data Qualifier NULL YES 9984
AS Poor Quality Assurance Results. Null Data Qualifier NULL YES 9985
AT Calibration. Null Data Qualifier NULL YES 9986
AU Monitoring Waived. Null Data Qualifier NULL YES 9987
AV Power Failure. Null Data Qualifier NULL YES 9988
AW Wildlife Damage. Null Data Qualifier NULL YES 9989
AX Precision Check. Null Data Qualifier NULL YES 9990
AY Q C Control Points (zero/span). Null Data Qualifier NULL YES 9991
AZ Q C Audit. Null Data Qualifier NULL YES 9992
BA Maintenance/Routine Repairs. Null Data Qualifier NULL YES 9993
BB Unable to Reach Site. Null Data Qualifier NULL YES 9994
BC Multi-point Calibration. Null Data Qualifier NULL YES 9995
BD Auto Calibration. Null Data Qualifier NULL YES 9996
BE Building/Site Repair. Null Data Qualifier NULL YES 9997
BF Precision/Zero/Span. Null Data Qualifier NULL YES 9998
BG Missing ozone data not likely to exceed level of standard. Null Data Qualifier NULL YES 9966
BH Interference/co-elution/misidentification. Null Data Qualifier NULL YES 9965
BI Lost or damaged in transit. Null Data Qualifier NULL YES 9964
BJ Operator Error. Null Data Qualifier NULL YES 9963
BK Site computer/data logger down. Null Data Qualifier NULL YES 9962
BL QA Audit. Null Data Qualifier NULL YES 9961
BM Accuracy check. Null Data Qualifier NULL YES 9960
BN Sample Value Exceeds Media Limit. Null Data Qualifier NULL YES 9947
BR Sample Value Below Acceptable Range. Null Data Qualifier NULL YES
CS Laboratory Calibration Standard. Null Data Qualifier NULL YES 9953
DA Aberrant Data (Corrupt Files, Aberrant Chromatography, Spikes, Shifts). Null Data Qualifier NULL YES 9951
DL Detection Limit Analyses. Null Data Qualifier NULL YES 9949
EC Exceeds Critical Criteria. Null Data Qualifier NULL YES
FI Filter Inspection Flag. Null Data Qualifier NULL YES 9959
MB Method Blank (Analytical). Null Data Qualifier NULL YES 9955
MC Module End Cap Missing. Null Data Qualifier NULL YES 9958
QV Quality Control Multi-point Verification. Null Data Qualifier NULL YES
SA Storm Approaching. Null Data Qualifier NULL YES 9957
SC Sampler Contamination. Null Data Qualifier NULL YES 9948
ST Calibration Verification Standard. Null Data Qualifier NULL YES 9954
SV Sample Volume out of limits. Null Data Qualifier NULL YES
TC Component Check & Retention Time Standard. Null Data Qualifier NULL YES 9952
TS Holding Time Or Transport Temperature Is Out Of Specs. Null Data Qualifier NULL YES 9956
XX Experimental Data. Null Data Qualifier NULL YES 9950
1C A 1-Point QC check exceeds acceptance criteria but there is compelling evidence that the analyzer data is valid. Missing QA/QC Audit NULL QC YES
1F No 1 Point QC but need to count for completeness Missing QA/QC Audit NULL QC YES
IA African Dust. Informational Only INFORM YES
IB Asian Dust. Informational Only INFORM YES
IC Chem. Spills & Indust Accidents. Informational Only INFORM YES
ID Cleanup After a Major Disaster. Informational Only INFORM YES
IE Demolition. Informational Only INFORM YES
IF Fire - Canadian. Informational Only INFORM YES
IG Fire - Mexico/Central America. Informational Only INFORM YES
IH Fireworks. Informational Only INFORM YES
II High Pollen Count. Informational Only INFORM YES
IJ High Winds. Informational Only INFORM YES
IK Infrequent Large Gatherings. Informational Only INFORM YES
IL Other. Informational Only INFORM YES
IM Prescribed Fire. Informational Only INFORM YES
IN Seismic Activity. Informational Only INFORM YES
IO Stratospheric Ozone Intrusion. Informational Only INFORM YES
IP Structural Fire. Informational Only INFORM YES
IQ Terrorist Act. Informational Only INFORM YES
IR Unique Traffic Disruption. Informational Only INFORM YES
IS Volcanic Eruptions. Informational Only INFORM YES
IT Wildfire-U. S. Informational Only INFORM YES
J Construction. Informational Only INFORM YES
E Forest Fire. Request Exclusion REQEXC NO
RU Wildland Fire Use Fire-U. S. Request Exclusion REQEXC NO
8 QA/QC Unknown. Quality Assurance Qualifier QA NO
PQ Values Between PQL And MDL. Quality Assurance Qualifier QA NO
T Multiple PM2.5 Validity Flags. Quality Assurance Qualifier QA NO
A High Winds. Informational Only INFORM NO
B Stratospheric Ozone Intrusion. Informational Only INFORM NO
C Volcanic Eruption. Informational Only INFORM NO
D Sandblasting. Informational Only INFORM NO
F Structural Fire. Informational Only INFORM NO
G High Pollen Count. Informational Only INFORM NO
H Chem. Spills & Indust. Accidents. Informational Only INFORM NO
I Unusual Traffic Congestion. Informational Only INFORM NO
IU Wildland Fire Use Fire-U. S. Informational Only INFORM NO
K Agricultural Tilling. Informational Only INFORM NO
L Highway Construction. Informational Only INFORM NO
M Rerouting of Traffic. Informational Only INFORM NO
N Sanding/Salting of Streets. Informational Only INFORM NO
O Infrequent Large Gatherings. Informational Only INFORM NO
P Roofing Operations. Informational Only INFORM NO
Q Prescribed Burning. Informational Only INFORM NO
R Cleanup After a Major Disaster. Informational Only INFORM NO
S Seismic Activity. Informational Only INFORM NO
U Sahara Dust. Informational Only INFORM NO
Z Other event. Informational Only INFORM NO