FAIRARI data SP-AMS 	
Data collected February – April 2022 at San Pietro Capofiume, BO, Italy
All data have been cleaned from HEPA filter runs, calibrations, and measurement errors. 
All times in local time (CET) with format: yyyy-mm-dd HH:MM:SS 
All time series mass concentrations data are in ug/m3
All NR-PM1 time series collected in Laser OFF V-mode MS
rBC time series collected in Laser ON V-mode MS
All mass spectra data collected in Laser OFF W-mode MS
All mass size distribution data are in ug/m3


General corrections:		
1.       Airbeam correction		
2.       Ionization efficiency and relative ionization efficiency based on calibrations using NH4NO3 (and Regal Black for rBC) during campaign		
3.       Composition dependent collection efficiency, time dependent. 		
4.       Fragmentation table adaptation for air Fragmentation Patterns using HEPA filter periods in PIKA. 
5.	 Correction and validation using co-located HR-TOF-AMS (interstitial AMS), which in turn validated against ion chromatography on PM1 filter samples). 


The following `csv` files are included, divided into categories (1-5) depending on what type of data they contain: 

1. 1-minute resolution timeseries of the PM1 bulk chemical composition, OA families, and elemental ratios

- `FAIRARI_SP-AMS_HR_timeseries_ambient.csv` includes ambient PM1 bulk chemical composition, OA families, and elemental ratios, collected behind the whole-air inlet. 
- `FAIRARI_SP-AMS_HR_timeseries_residuals.csv` includes fog residual PM1 bulk chemical composition, OA families, and elemental ratios, collected behind the GCVI inlet. 

These two `csv` files contain the following columns: 

- `datetime` 	 Date and time in local time (CET) with format YYYY-MM-DD hh:mm:ss 
- `HROrg` 	 High resolution mass concentration of organics (ug/m3)
- `HRNO3` 	 High resolution mass concentration of nitrates (ug/m3)
- `HRSO4` 	 High resolution mass concentration of sulfates (ug/m3)
- `HRNH4` 	 High resolution mass concentration of ammonium (ug/m3)
- `HRChl` 	 High resolution mass concentration of chloride (ug/m3)
- `HRBC` 	 High resolution mass concentration of black carbon (ug/m3)
- `familyCH` 	 High resolution mass concentration CH-ions (ug/m3)
- `familyCHO1` 	 High resolution mass concentration of CHO_1-ions (ug/m3)
- `familyCHOgt1` High resolution mass concentration of CHOgt1-ions(ug/m3)
- `familyCHN` 	 High resolution mass concentration of CHN-ions (ug/m3)
- `familyCHO1N`  High resolution mass concentration of CHO1N-ions (ug/m3)
- `Ratio_O_C_IA` Elemental ratio of oxygen:carbon in the organics
- `Ratio_N_C_IA` Elemental ratio of nitrogen:carbon in the organics


2. 5-minute resolution timeseries of CHN1 and CHN2 mass concentrations. Averaging was done with time_end as new time. 

- `FAIRARI_SP-AMS_HR_timeseries_CHN1_CHN2.csv` includes CHN1 and CHN2 mass concentration (in ug/m3) measured in ambient and fog residuals.

This `csv` file contains the following columns:

- `datetime` 	         Date and time in local time (CET) with format YYYY-MM-DD hh:mm:ss 
- `familyCHN1_ambient` 	 High resolution mass concentration of CHN1-ions (ug/m3) in non-fog ambient aerosol
- `familyCHN1_fog_resid` High resolution mass concentration of CHN1-ions (ug/m3) in fog residuals 
- `familyCHN2_ambient` 	 High resolution mass concentration of CHN2-ions (ug/m3) in non-fog ambient aerosol
- `familyCHN2_fog_resid` High resolution mass concentration of CHN2-ions (ug/m3) in fog residuals 


3. Average high resolution (HR) mass spectra for the organic nitrogen (ON) ions

- `FAIRARI_SP-AMS_ON_mass_spectra_ambient.csv` includes average ambient ON mass spectra as percentage of total OA signal collected behind the whole-air inlet.
- `FAIRARI_SP-AMS_ON_mass_spectra_fog_residuals.csv` includes average fog residual ON mass spectra as percentage of total OA signal collected behind the GCVI inlet.
- `FAIRARI_SP-AMS_ON_mass_spectra_fog_water.csv` includes average fog water ON mass spectra as percentage of total OA signal from the fog water samples.
- `FAIRARI_SP-AMS_ON_mass_spectra_interstitial.csv` includes average interstitial ON mass spectra as percentage of total OA signal collected behind the PM2.5 inlet. 

These 4 `csv` files contain the following columns:

- `amu_mz_HR` 	Mass to charge (m/z) ratio
- `familyCHN1` 	Fraction of CHN1-ions signal over total organic signal
- `familyCHN2` 	Fraction of CHN2-ions signal over total organic signal
- `familyCHO1N`	Fraction of CHO1N-ions signal over total organic signal


4. Chemically resolved aerosol mass size distribution data over time

- `FAIRARI_SP-AMS_mass_size_dist_timeseries_NH4_ambient.csv` includes the ambient NH4 mass size distribution collected behind the whole-air inlet. 
- `FAIRARI_SP-AMS_mass_size_dist_timeseries_NH4_fog_resid.csv` includes the fog residual NH4 mass size distribution collected behind the GCVI inlet. 
- `FAIRARI_SP-AMS_mass_size_dist_timeseries_NO3_ambient.csv` includes the ambient NO3 mass size distribution collected behind the whole-air inlet. 
- `FAIRARI_SP-AMS_mass_size_dist_timeseries_NO3_fog_resid.csv` includes the fog residual NO3 mass size distribution collected behind the GCVI inlet. 
- `FAIRARI_SP-AMS_mass_size_dist_timeseries_OA_ambient.csv` includes the ambient OA mass size distribution collected behind the whole-air inlet. 
- `FAIRARI_SP-AMS_mass_size_dist_timeseries_OA_fog_resid.csv` includes the fog residual OA mass size distribution collected behind the GCVI inlet. 
- `FAIRARI_SP-AMS_mass_size_dist_timeseries_rBC_ambient.csv` includes the ambient rBC mass size distribution collected behind the whole-air inlet. 
- `FAIRARI_SP-AMS_mass_size_dist_timeseries_rBC_fog_resid.csv` includes the fog residual rBC mass size distribution collected behind the GCVI inlet. 
- `FAIRARI_SP-AMS_mass_size_dist_timeseries_SO4_ambient.csv` includes the ambient SO4 mass size distribution collected behind the whole-air inlet. 
- `FAIRARI_SP-AMS_mass_size_dist_timeseries_SO4_fog_resid.csv` includes the fog residual SO4 mass size distribution collected behind the GCVI inlet. 

These 10 `csv` files contain the following columns:

- `datetime`      Date and time in local time (CET) with format YYYY-MM-DD hh:mm:ss
- `column 2 - 51` DM/dlog10dva (ug/m3), where each column corresponds to the rows 1 - 50 of FAIRARI_SP-AMS_mass_size_diameter.csv 


5. Particle diameter (nm) 

- `FAIRARI_SP-AMS_mass_size_diameter.csv` includes one column of 50 rows which corresponds to the particle diameter of column 2-51 of FAIRARI_SP-AMS_mass_size_dist_timeseries_...csv

This `csv` file contains the following column:

- `diameter_Dva_nm` Aerodynamic vacuum particle diameter (D_va) in nanometers (nm)