2020 Purdue FNR Ecological Sensors Class Air Quality Data

<p>These data are the results of a class project studying air quality. Students in the Purdue Forestry class Ecological Sensors & Data (FNR49800-042). met in Spring 2020. During the spring semester, the COVID-19 lockdown forced students to return home. Students worked at home to deploy a network of air quality sensors using embedded microcontrollers and sensors that are part of the Particle Air Quality Monitoring Kit (https://docs.particle.io/quickstart/aqmk-project/).</p>

<p>Sensors included:</p>

<ul>
<li>Shinyei PPD42 Dust Sensor</li>
<li>BME280 Temperature  and Humidity Sensor</li>
<li>Seeed Studio Grove Air Quality Sensor v1.3 with metal-oxide sensor.</li>
</ul>

<p>Students collected either indoor or outdoor data. Location of the data and whether the sensor was located indoors or outdoors is included in the metadata table. Note: locations of sensors are approximate to protect privacy of those with indoor air quality sensors. Sensor data are presented here in a raw, unedited form. Thus, data should subjected to quality control checks to identify data that are compromised by instrument error before use.</p>

<p>The time series data are included as a single CSV files. The columns in the CSV file are defined as follows:</p>

<ul>
<li>site_id: unique site identification for each sensor.</li>
<li>Temperature: temperature in °C.</li>
<li>Pressure: barometric pressure in pascals.</li>
<li>Humidity: percent humidity.</li>
<li>Battery Voltage: voltage of the attached battery or other power source.</li>
<li>AQ Sensor Slope: An integer value corresponding to increased presence of volatile organic compounds (VOCs) detected by the metal oxide sensor. Values are semi-quantitative and range from 0 to 3.</li>
<li>AQ Sensor Raw: A raw value obtained from the metal oxide sensor in millivolts. Increasing values indicate higher levels of VOCs.</li>
<li>LPO: Low pulse occupancy. The amount of time during a reading that the dust sensor was detecting particulate matter.</li>
<li>Dust Ratio: The LPO value standardized for the amount of time that data were collected.</li>
<li>dt: Date and time in Eastern Standard Time (GMT -5).</li>
<li>Latitude: Latitude in decimal degrees. May be approximate to protect privacy.</li>
<li>Longitude: Longitude in decimal degrees. May be approximate to protect privacy.</li>
<li>Location: Indicates whether the sensor was deployed at an "Indoor" or "Outdoor" location.</li>
<li>Stove: For "Indoor" locations, indicates what type of stove was present in the household ("Gas" or "Electric"). For outdoor locations, this variable was left blank.</li>
</ul>