This README.txt file was generated on 20181113 by Albert Presto ------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset: Mobile AMS (aerosol mass spectrometer) datasets collected as part of CACES. 2. Author Information Corresponding Author Contact Information Name: Albert Presto Institution: Carnegie Mellon University Address: 5000 Forbes Ave, Pittsburgh, PA 15213 Email: apresto@andrew.cmu.edu Author Contact Information Name:Peishi Gu Email: peishigu@gmail.com Author Contact Information Name:Rishabh Shah Email: rshah6192@gmail.com --------------------- DATA & FILE OVERVIEW --------------------- Directory of Files A. Filename: Pittsburgh_AMS_Mobile_2016_2017.xlsx This file contains mobile AMS data collected in Pittsburgh in 2016-2017. It is identical to the dataset used in Gu et al (ES&T, 2018, DOI: 10.1021/acs.est.8b03833). Data are reported for total PM mass, PM components, and organic aerosol components determined from positive matrix factorization (PMF). The file also contains data for concurrent measurements of particulate black carbon (BC), and gaseous pollutants (CO, CO2, NO, NO2, NOx). B. Filename: README_AMS_Mobile.txt Short description: ReadMe file ----------------------------------------------------------- DATA DESCRIPTION FOR: Pittsburgh_AMS_Mobile_2016_2017.xlsx ----------------------------------------------------------- 1. Number of variables: 47 2. Number of cases/rows: 16393 3. Missing data codes: NaN (blank cell) -- missing gas data for CO2, CO, NO, NO2, NOx 4. Variable List A. Name: OBJECTID Description: Column A. Counter for data point number in the series. B. Name: datetime Description: Column B. Timestamp of AMS data. C. Name: run_index Description: Column C. Global index of sample numbers logged by the instrument. D. Name: Longitude Description: Column D. Mean longitude measured during each sample. E. Name: latitude Description: Column E. Mean latitude measured during each sample. F. Name: Elevation Description: Column F. Mean elevation above sea level (meters) measured during each sample. G. Name: hour Description: Column G. Hour of the day. H. Name: CO2 Description: Column H. CO2 concentration measured in ppm. I. Name: CO Description: Column I. CO concentration measured in ppb. J. Name: NO Description: Column J. NO concentration measured in ppb. K. Name: NO2 Description: Column K. NO2 concentration measured in ppb. L. Name: NOx Description: Column L. NOx (=NO + NO2) measured in ppb. M. Name: matlab_date Description: Column M. matlab-encoded date value for use in background correction of BC. N. Name: month Description: Column N. Month of the year. O. Name: PageName Description: Column O. Corresponds to "page" in GIS used for spatial aggregation of data. P. Name: PageNumber Description: Column P. Corresponds to "page" in GIS used for spatial aggregation of data. Q. Name: Population Description: Column Q. Population in the specific page used for aggregating this data point. R. Name: VMT_daily Description: Column R. Daily vehicle miles traveled (VMT) in the specific page. S. Name: VMT_daily_truck Description: Column S. Daily VMT contributed by diesel trucks in each page. T. Name: Restaurant_Count Description: Column T. Number of restaurants in the page. U. Name: Road_length_meter Description: Column U. Road length, in meters, in the page. V. Name: MOOOA Description: Column V. Concentration of MOOOA (more oxidized oxidized organic aerosol) from PMF analysis. Units: microgram/m^3. W. Name: LOOOA Description: Column W. Concentration of LOOOA (more oxidized oxidized organic aerosol) from PMF analysis. Units: microgram/m^3. X. Name: BBOA Description: Column X. Concentration of BBOA (biomass burning organic aerosol) from PMF analysis. Units: microgram/m^3. Y. Name: COA Description: Column Y. Concentration of COA (cooking organic aerosol) from PMF analysis. Units: microgram/m^3. Z. Name: HOA Description: Column Z. Concentration of HOA (hydrocarbon-like organic aerosol) from PMF analysis. Units: microgram/m^3. AA. Name: Residual Description: Column AA. Residual from the PMF fit. Units: microgram/m^3 AB. Name: Org Description: Column AB. Organic aerosol concentration in microgram/m^3. AC. Name: OrgRB Description: Column AC. Regional background organic aerosol concentration in microgram/m^3. AD. Name: OrgLocal Description: Column AD. Local organic aerosol concentration (Org - OrgRB). AE. Name: SO4 Description: Column AE. Particulate sulfate concentration. AF. Name: SO4RB Description: Column AF. Regional background sulfate concentration. AG. Name: SO4Local Description: Column AG. Local sulfate concentration. AH. Name: NO3 Description: Column AH. Particulate nitrate concentration. AI. Name: NO3RB Description: Column AI. Regional background nitrate concentration. AJ. Name: NO3Local Description: Column AJ. Local nitrate concentration. AK. Name: NH4 Description: Column AK. Particulate ammonium concentration. AL. Name: NH4RB Description: Column AL. Regional background ammonium concentration. AM. Name: NH4Local Description: Column AM. Local ammonium concentration. AN. Name: BC Description: Column AN. Black carbon (BC) concentration. AO. Name: BCRB Description: Column AO. Regional background BC concentration. AP. Name: BCLocal Description: Column AP. Local BC concentration. AQ. Name: Weight Description: Column AQ. The sampling rate differs in some cases. Some samples were collected at 60 sec resolution, others at 30 sec, and most at 20 sec. In the process of spatial joining, the weight of each sample must be taken into consideration. In the column “weight” lists the relative weight of each sample, 3 is 60 sec samples, 1.5 for 30 sec and 1 for 20 sec. AR. Name: Site Description: Column AR. Each sample is also assigned a "site" that corresponds to the neighborhood where the sample was collected. AS. Name: Period Description: Column AS. Column “period” is a dummy variably that denote which period of day was this sample collected. “1” stands for morning (5-10), “2” stands for mid-day (11-16), “3” stands for evening (17-22) and “4” stands for overnight (23-4). AT. Name: Season Description: Column AT. “1” is summer (8,9), “2” is fall (11) and “3” is winter (12, 1 and 2). AU. Name: Type Description: Column AU. “Type” is the land-use classification based on the GIS covariates (VMT and restaurant count). Type 1 has 0 VMT and 0 restaurant, Type 2 has 0 VMT and >0 restaurant, Type 3 has >0 VMT and 0 restaurant, Type 4 has >0 VMT and >0 restaurant. --------------------------------------------------------------------- METHODOLOGICAL INFORMATION FOR: Pittsburgh_AMS_Mobile_2016_2017.xlsx --------------------------------------------------------------------- # # Software: If specialized software(s) generated your data or # are necessary to interpret it, please provide for each (if # applicable): software name, version, system requirements, # and developer. # 1. Software-specific information: Name: SQUIRREL Version: 1.61 Source Repository URL: http://cires1.colorado.edu/jimenez-group/ToFAMSResources/ToFSoftware/#Analysis2 Name: PIKA Version: 1.21F Source Repository URL: http://cires1.colorado.edu/jimenez-group/ToFAMSResources/ToFSoftware/#Analysis2 Name: AMS PMF tool Version: 3.04 A Source Repository URL: http://cires1.colorado.edu/jimenez-group/wiki/index.php/PMF-AMS_Analysis_Guide#PMF_Evaluation_Tool_Software Application notes: The PMF factors are based on the 5 factor solution with fpeak=-0.4. Sensitivity analysis of the PMF factorization is found in the supporting information of Gu et al (2018, DOI: 10.1021/acs.est.8b03833). # # Equipment: If specialized equipment generated your data, # please provide for each (if applicable): equipment name, # manufacturer, model, and calibration information. Be sure # to include specialized file format information in the data # dictionary. # 2. Equipment-specific information: See Methods section of Gu et al (2018, DOI: 10.1021/acs.est.8b03833). # # Dates of Data Collection: List the dates and/or times of # data collection. # 3. Date of data collection (single date, range, approximate date) : 20160808 - 20170217