diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1d1922a..00cf6cd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -74,3 +74,4 @@ add_subdirectory(update_bc)
 add_subdirectory(ens_mean_recenter)
 add_subdirectory(FV3_ensmean_recenter)
 add_subdirectory(bufrsnd)
+add_subdirectory(pm)
diff --git a/pm/CMakeLists.txt b/pm/CMakeLists.txt
new file mode 100644
index 0000000..0d4a639
--- /dev/null
+++ b/pm/CMakeLists.txt
@@ -0,0 +1,13 @@
+list(APPEND src_pm
+  process_pm.f90)
+
+add_executable(process_pm.exe ${src_pm})
+target_link_libraries(process_pm.exe PRIVATE bufr::bufr_4
+                                          PRIVATE MPI::MPI_Fortran)
+
+install(
+  TARGETS process_pm.exe
+  EXPORT ${PROJECT_NAME}Exports
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
diff --git a/pm/process_pm.f90 b/pm/process_pm.f90
new file mode 100644
index 0000000..39a6042
--- /dev/null
+++ b/pm/process_pm.f90
@@ -0,0 +1,138 @@
+program pmbufr
+
+ implicit none
+
+ integer, parameter :: mxmn=35, mxlv=255, maxcnt=5000, pm_limit=-15
+ integer :: ireadmg,ireadsb,idate,nmsg,ntb,nsubset,nlvl
+ integer :: i,j,k,NARG,iret_hdr,iret_ob,interval
+ integer :: dhr,iret_hdr1,iret_ob1,cnt
+ integer :: unit_table,unit_out,unit_site,unit_var,nt,pm_len
+
+ character(80):: hdstr='SID XOB YOB DHR TYP T29 SQN PROCN RPT CAT TYPO TSIG'
+ character(80):: obstr='TPHR QCIND COPOPM'
+ character(8) :: subset,c_sid
+ character(10):: analysis_time
+ character(20):: str,infile,outfile
+ character(20),allocatable,dimension(:)::sta_id, lat_str, lon_str, elv_str, pm_aqi_str, pm_measured_str, pm_str
+
+ real*8,parameter:: bmiss=10e10_8
+ real(8) :: hdr(mxmn),obs(mxmn,mxlv)
+ real(8) :: rstation_id, lat, lon, elv, pm
+
+ logical :: ifexist
+
+ namelist/setup/analysis_time,infile,outfile,cnt
+
+ ! only c_sid*8 is encoded to bufr file since SID is 64 bit in bufrtable
+ equivalence(rstation_id,c_sid)
+
+! read namelist
+ inquire(file='namelist.pm', EXIST=ifexist )
+ if(ifexist) then
+   open(15, file='namelist.pm')
+     read(15,setup)
+   close(15)
+   write(*,'(a45,a20,3x,2a20,i8)') 'analysis_time, infile, outfile, cnt: ' ,analysis_time, infile, outfile, cnt    
+   write(*,*)
+ else
+   write(*,*) "Usage: analysis_time, infile, outfile, pm_count"
+ stop 123
+
+ endif
+
+ if (cnt==0) then
+   write(*,*) 'No observation available, exit'
+   stop
+ end if
+
+! open and read pm2.5 ascii file
+ unit_var=11
+ allocate(sta_id(cnt))
+ allocate(lat_str(cnt))
+ allocate(lon_str(cnt))
+ allocate(elv_str(cnt))
+ allocate(pm_aqi_str(cnt))
+ allocate(pm_measured_str(cnt))
+ allocate(pm_str(cnt))
+
+ open (unit = unit_var, file = infile,status = 'old')
+ do i = 1,cnt
+   read(unit_var,'(7a16)')            sta_id(i), lat_str(i), lon_str(i), elv_str(i), pm_aqi_str(i), pm_measured_str(i), pm_str(i)
+ end do
+
+
+! open output files and write bufr table to output files
+
+ unit_out=12
+ unit_table=13
+ open(unit_table,file='pm.bufrtable')
+ open(unit_out,file=outfile,action='write',form='unformatted')
+ call openbf(unit_out,'OUT',unit_table)
+
+ !call maxout(20000) ! 20k byte any message size
+ call datelen(10)
+
+ ! unchaged variables for each profile at current time
+ subset="ANOWPM"
+ read(analysis_time,'(I10)')  idate    ! string to integer
+
+
+ do j=1, cnt
+
+  hdr=bmiss
+  obs=bmiss;
+
+  ! write out pm which is not empty as single character ", but has valule e.g. "2.0
+  pm_len=len(trim(adjustl(pm_str(j))))
+  if (pm_len > 1) then
+
+    str=adjustl(lat_str(j))
+    read(str(2:),'(f15.6)') lat
+
+    str=adjustl(lon_str(j))
+    read(str(2:),'(f15.6)') lon
+
+    str=adjustl(elv_str(j))
+    read(str(2:),'(f15.6)') elv
+
+    str=adjustl(pm_str(j))
+    read(str(2:),'(f15.6)') pm
+
+    str=adjustl(sta_id(j))
+    c_sid=str(2:9)
+    hdr(1)=rstation_id; hdr(2)=lon; hdr(3)=lat; hdr(4)=0.0_8; hdr(5)=102; hdr(10)=6 ! Single level report
+
+
+    nlvl=1
+    obs(1,nlvl)=-1.0_8
+
+    if (pm > 0.0) then
+      obs(2,nlvl)=0.0_8
+      obs(3,nlvl)=pm*1e-9_8  ! "UG/M3" to KG/M3
+      write(*,'(a25,i7,a12,3f10.2,f15.12)') 'goodObs: pm>0',j,c_sid,lat,lon,obs(2,nlvl),obs(3,nlvl)
+    else if (pm > pm_limit) then
+      obs(2,nlvl)=0.0_8
+      obs(3,nlvl)=0.0_8
+      write(*,'(a25,i7,a12,3f10.2,f15.12)') 'limitObs: -15<pm<0',j,c_sid,lat,lon,obs(2,nlvl),obs(3,nlvl)
+    else
+      obs(2,nlvl)=bmiss
+      obs(3,nlvl)=bmiss
+      write(*,'(a25,i7,a12,3f10.2,f15.12)') 'badObs: pm<-15',j,c_sid,lat,lon,obs(2,nlvl),obs(3,nlvl)
+    endif
+
+    ! only encode hdr and obs, no err and qc since these are not defined in pm.bufrtable 
+    call openmb(unit_out,subset,idate)
+    call ufbint(unit_out,hdr,mxmn,1,iret_hdr,hdstr)
+    call ufbint(unit_out,obs,mxmn,nlvl,iret_ob,obstr)
+    call writsb(unit_out)
+
+  endif
+ enddo
+
+ write(*,*) "Process PM is successful"
+
+ call closbf(unit_out)
+ close(unit_var)
+
+end program
+