Understanding the Data

Data from the BEVO Beacon come in two flavors:

1. Continuous, One-minute resolution data from 24 parameters
2. Summary statistics of 5 key parameters

Continuous IAQ Measurements

The primary data measured by the device. Below is a data dictionary for each of the parameters. The naming convention follow the form of the parameter name and units separated by a hyphen and underscores used for compounds words i.e. <parameter_name-unit_name>.

Name	Type	Description	Example
timestamp	String	Date and time that the measurements were taken	2/24/2022 12:02:38 AM
carbon_monoxide-ppb	Float	Carbon monoxide (CO) concentration measured in parts-per-billion	5717.6
carbon_dioxide-ppm	Float	Carbon dioxide (CO2) concentration measured in parts-per-million	643.75766
infrared-unitless	Int	Infrared level measured by the sensor. This value is relative to the sensor - see here	10
light-lux	Float	Light level in lux	2.04
nitrogen_dioxide-ppb	Float	Nitrogen dioxide (NO2) concentration measured in parts-per-billion	14.7
pm1_mass-microgram_per_m3	Float	Mass concentration of particulate matter with aerodynamic diameters less than or equal to 1 micrometer (PM1)	1.809985101
pm2p5_mass-microgram_per_m3	Float	Mass concentration of particulate matter with aerodynamic diameters less than or equal to 2.5 micrometers (PM2.5)	3.204213172
pm4_mass-microgram_per_m3	Float	Mass concentration of particulate matter with aerodynamic diameters less than or equal to 4 micrometers (PM4)	4.176454574
pm10_mass-microgram_per_m3	Float	Mass concentration of particulate matter with aerodynamic diameters less than or equal to 10 micrometers (PM10)	4.216798097
pm0p5_count-number_per_cm3	Float	Number concentration of particulate matter with aerodynamic diameters less than or equal to 0.5 micrometers	9.002523065
pm1_count-number_per_cm3	Float	Number concentration of particulate matter with aerodynamic diameters less than or equal to 1 micrometer	12.79670811
pm2p5_count-number_per_cm3	Float	Number concentration of particulate matter with aerodynamic diameters less than or equal to 2.5 micrometers	14.23749542
pm4_count-number_per_cm3	Float	Number concentration of particulate matter with aerodynamic diameters less than or equal to 4 micrometers	14.41311932
pm10_count-number_per_cm3	Float	Number concentration of particulate matter with aerodynamic diameters less than or equal to 10 micrometers	14.4395709
rh_from_co-percent	Float	Relative Humidity (RH) -- as a percentage -- measured by the CO sensor	44.0
rh_from_no2-percent	Float	Relative Humidity (RH) -- as a percentage -- measured by the NO2 sensor	45.0
t_from_co-c	Float	Temperature (T) -- in Celsius -- measured by the CO sensor	25.0
t_from_no2-c	Float	Temperature (T) -- in Celsius -- measured by the NO2 sensor	24.2
total_volatile_organic_compounds-ppb	Float	Total volatile organic compounds (TVOC) concentration measured in ppb	8.2
visible-unitless	Int	Visible level measured by the sensor. This value is relative to the sensor - see here	65540
equivalent_carbon_dioxide-ppm	Float	TVOC concentration converted to an "equivalent" CO2 concentration	478.8

Summary Statistics

Below is the extent of what is included in the summary statistics JSON file. These values can be updated in the source code, specifically the calculate_summary_stats.py script.

{
    "carbon_dioxide": {
        "unit": "ppm",
        "min": 271.4111429850261,
        "mean": 515.396034978425,
        "median": 551.7839152018229,
        "max": 974.8577270507812,
        "time_above_threshold": 0
    },
    "pm2p5_mass": {
        "unit": "microgram_per_m3",
        "min": 0.8063094317913055,
        "mean": 4.882732290393523,
        "median": 4.278424739837647,
        "max": 15.79368495941162,
        "time_above_threshold": 5
    },
    "carbon_monoxide": {
        "unit": "ppm",
        "min": 0,
        "mean": 3.1380335877862597,
        "median": 3.2502,
        "max": 7.0952,
        "time_above_threshold": 11
    },
    "temperature": {
        "unit": "c",
        "min": 22.981367186999996,
        "mean": 25.9284674030229,
        "median": 26.262416436,
        "max": 26.262416436,
        "time_above_threshold": 0
    },
    "relative_humidity": {
        "unit": "percent",
        "min": 44.0,
        "mean": 47.796946564885495,
        "median": 48.0,
        "max": 49.0,
        "time_above_threshold": 0
    }
}