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      <FormerOfcrEmployeesListedInd>true</FormerOfcrEmployeesListedInd>
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      <CompensationFromOtherSrcsInd>false</CompensationFromOtherSrcsInd>
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        <ProgramServicesAmt>8218</ProgramServicesAmt>
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      <OrganizationFollowsSFAS117Ind>X</OrganizationFollowsSFAS117Ind>
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      <NetUnrlzdGainsLossesInvstAmt>14427</NetUnrlzdGainsLossesInvstAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
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      <AuditCommitteeInd>true</AuditCommitteeInd>
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      <FederalGrantAuditPerformedInd>true</FederalGrantAuditPerformedInd>
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        <ContributorNum>RESTRICTED</ContributorNum>
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        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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      <PaidStaffOrManagementInd>false</PaidStaffOrManagementInd>
      <MediaAdvertisementsInd>false</MediaAdvertisementsInd>
      <MailingsMembersInd>true</MailingsMembersInd>
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      <PublicationsOrBroadcastInd>false</PublicationsOrBroadcastInd>
      <GrantsOtherOrganizationsInd>false</GrantsOtherOrganizationsInd>
      <DirectContactLegislatorsInd>false</DirectContactLegislatorsInd>
      <RalliesDemonstrationsInd>false</RalliesDemonstrationsInd>
      <OtherActivitiesInd>true</OtherActivitiesInd>
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      <TotalLobbyingExpendituresAmt>4496</TotalLobbyingExpendituresAmt>
      <NotDescribedSection501c3Ind>false</NotDescribedSection501c3Ind>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE C, PART II-B, LINE 1</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION SEEKS TO EDUCATE MEMBERS OF CONGRESS AND CONGRESSIONAL STAFF REGARDING IMPORTANT ISSUES RELATED TO AIR POLLUTION CONTROL. AS A PART OF THESE EDUCATIONAL EFFORTS, THE ORGANIZATION WILL FROM TIME TO TIME ADVOCATE FOR A PIECE OF LEGISLATION. THIS ADVOCACY IS EXPRESSED VIA MEETINGS OR LETTERS OF SUPPORT.</ExplanationTxt>
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        <DepreciationAmt>12014</DepreciationAmt>
      </EquipmentGrp>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>1723990</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>14427</NetUnrealizedGainsInvstAmt>
      <RevenueNotReportedAmt>14427</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1709563</RevenueSubtotalAmt>
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      <ExpensesSubtotalAmt>1951947</ExpensesSubtotalAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PAGE 3, PART X</FormAndLineReferenceDesc>
        <ExplanationTxt>NACAA COMPLIES WITH THE PROVISIONS OF FASB ACCOUNTING STANDARDS CODIFICATION TOPIC "ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES" FOR THE YEARS ENDED SEPTEMBER 30, 2017 AND 2016, NO UNRECOGNIZED TAX PROVISION OR BENEFIT EXISTS.</ExplanationTxt>
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      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>false</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>NANCY R KRUGER</PersonNm>
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        <DeferredCompensationFlngOrgAmt>18165</DeferredCompensationFlngOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KAREN MONGOVEN</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>S WILLIAM BECKER</PersonNm>
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    <IRS990ScheduleO documentId="RetDoc6">
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        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE 990 IS REVIEWED BY THE EXECUTIVE DIRECTOR</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>AN UPDATED CONFLICT OF INTEREST POLICY IS REQUIRED TO BE SIGNED BY ALL EMPLOYEES ANNUALLY.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION USES A COMPENSATION COMMITTEE MADE UP OF THE PRESIDENTS, VICE PRESIDENTS AND FUNDING COMMITTEE CHAIRS TO REVIEW COMPENSATION OF THE EXECUTIVE DIRECTOR AND KEY EMPLOYEES ANNUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION USES A COMPENSATION COMMITTEE MADE UP OF THE PRESIDENTS, VICE PRESIDENTS AND FUNDING COMMITTEE CHAIRS TO REVIEW COMPENSATION OF THE EXECUTIVE DIRECTOR AND KEY EMPLOYEES ANNUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGE 6, PART VI, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>CONTRACT EXPENSES 0 172,796 0 PROFESSIONAL FEES 59,009 0 0 PROFESSIONAL FEES 110 351 0 TOTAL 59,119 173,147 0</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>