Real-Time Air Quality and Atmospheric Chemistry — FIU Miami Campus

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Real-Time Air Quality and Atmospheric Chemistry — FIU Miami Campus This dataset is a living, DOI-citable archive of real-time environmental observations from five instruments on and around the Florida International University (FIU) Modesto A. Maidique Campus in Miami, Florida. It captures the operational state of three instrument platforms: a PurpleAir PA-II fleet (three sensors reporting particulate matter), a Tempest WeatherFlow station (meteorology), and a Pandora 256 spectrometer (total-column atmospheric chemistry, via the Pandonia Global Network). Together they provide a continuous, heterogeneous, ground-based view of urban air quality and trace-gas chemistry at a subtropical coastal U.S. metropolitan site. The archive is designed for researchers studying urban air quality, atmospheric chemistry, tropospheric NO₂ and O₂ loading, public-health exposure, and urban climate; for educators teaching FAIR data principles; and for practitioners (city agencies, community groups, downstream integrators) who need machine-readable open air-quality data for Miami. 📝 Quick start. Cite this dataset by its DOI: 10.34703/gzx1-9v95/BXFZ5Y. The data files are too numerous to list in Dataverse (~900 daily CSVs and growing); instead, open sensor_inventory.csv attached to this record. Each row gives you a direct HTTPS URL, an OSDF URL, and a SHA-256 for one daily CSV. For live status and bounded history queries, use the public dashboard API. ⚡ Realtime and update cadence. This record describes a realtime observational program. The dashboard/API provide near-realtime current readings and bounded history from the production MySQL service. The Pelican archive currently includes daily CSV files through 2026-05-12. The planned operational cadence is: daily Pelican CSV updates for newly completed UTC days, continuous dashboard/API refresh from MySQL at approximately minute cadence, and Dataverse metadata/version refreshes approximately quarterly or when schema/sensor coverage changes. 🔗 Public dashboard and API references. Public narrative dashboard: https://maps.fiu.edu/realtime-sensor/dashboard-narrative. Public API reference: https://maps.fiu.edu/realtime-sensor/api/data/stats. ArcGIS Online station discovery item: https://FIUGIS.maps.arcgis.com/home/item.html?id=d3ed107fcffb4bde927dc79829504c54. ArcGIS FeatureServer API: https://services2.arcgis.com/FtJyXM7nBotS8g5t/arcgis/rest/services/Real_Time_Air_Quality_FIU_Miami_Campus_Stations/FeatureServer. 📁 What is in this Dataverse record This Dataverse record carries metadata, navigational tables, and preview samples. The full per-day CSV archive (~900 files at v1.0 cut, growing continuously) is hosted on the Open Science Data Federation (OSDF) via the FIU Pelican origin server, because the archive grows outside the Dataverse versioning cadence. See Accessible below for access patterns. README.md — Dataset overview, quick start, access patterns, quality disclosures. data_dictionary.md — Per-column schema, units, valid ranges, provenance for every published column across all three sources. station_locations.geojson — RFC 7946 GeoJSON, one Feature per physical instrument (5 features), WGS84 / CRS84. Loads directly in QGIS, ArcGIS, Leaflet, MapLibre. sensor_inventory.csv — Per-(sensor, date) index of every file on Pelican, with HTTPS + OSDF URLs and SHA-256 integrity. sample_purpleair_24h.csv / sample_tempest_24h.csv / sample_pandora_24h.csv — One-day previews of each source (most recent complete UTC day; Pandora sample picked outside the 14-day refresh window for stability). 💡 Note: To access the full archive, use sensor_inventory.csv's per-row URLs. No authentication is required for read access to the /envistor/fiu-gis-center/ Pelican namespace. 📌 F — Findable Registered with a persistent DOI in the FIU GIS Center Dataverse Collection. The DOI is a concept DOI that resolves to the most recent published version; historical versions remain accessible via the Dataverse version switcher. Indexed via Dataverse's OAI-PMH endpoint; harvestable into DataONE, OpenAIRE, B2FIND. Keywords are aligned to the NASA GCMD Earth Science vocabulary (Air Quality, Particulate Matter, Nitrogen Dioxide, Ozone, Atmospheric Chemistry, Trace Gases, Meteorological Stations, Ground-based Observations) plus free-text instrument/platform keywords (Pandora Spectrometer, PurpleAir, Tempest WeatherFlow). The spatial footprint and temporal range are declared in the Dataverse metadata (see Time & Place block of this record), and the per-station coordinates are available in station_locations.geojson. 🔒 A — Accessible Dataverse: small metadata and sample artifacts are deposited directly and are freely downloadable under CC BY 4.0. Full archive (daily CSVs): hosted on OSDF via the FIU Pelican origin server at: OSDF namespace: osdf://envistor/fiu-gis-center/realtime-air-quality/ HTTPS mirror: https://pelican.fiu.edu:8443/envistor/fiu-gis-center/realtime-air-quality/ Integrity record: https://pelican.fiu.edu:8443/envistor/fiu-gis-center/realtime-air-quality/manifest.json — SHA-256, byte size, last-modified timestamp for every file in the archive. How to access: No account required for read access. The /envistor/fiu-gis-center/ namespace is configured as PublicReads. Install the Pelican client: see Pelican Platform — Accessing Data. Download a single file: pelican object get osdf://envistor/fiu-gis-center/realtime-air-quality/tempest/2026-04-20.csv ./ Download a full source (resumable, parallel): pelican object sync osdf://envistor/fiu-gis-center/realtime-air-quality/pandora/ ./pandora_archive/ Or just curl individual HTTPS URLs from sensor_inventory.csv — no specialized client needed. Metadata accessibility is independent of Pelican availability: even if the OSDF origin is transiently unreachable, this Dataverse record and the attached navigational tables remain resolvable through the DOI. Realtime API: lightweight current, bounded-history, and aggregate endpoints are exposed by the deployed dashboard at https://maps.fiu.edu/realtime-sensor/api/data/stats. The API is intended for application integration and exploratory access; Pelican/OSDF remains the reproducible bulk archive, and Dataverse remains the DOI/citation record. ArcGIS Online: AGOL is used as a discovery and visualization layer, not as the raw minute-level archive. Recommended AGOL layers are station locations, current status, and optional daily/hourly aggregates. Full raw CSV archives remain on Pelican to avoid AGOL feature-layer size, credit, and append-performance limits. ArcGIS Online API reference: station discovery item page: https://FIUGIS.maps.arcgis.com/home/item.html?id=d3ed107fcffb4bde927dc79829504c54; feature layer REST endpoint: https://services2.arcgis.com/FtJyXM7nBotS8g5t/arcgis/rest/services/Real_Time_Air_Quality_FIU_Miami_Campus_Stations/FeatureServer. 🔁 I — Interoperable File format: RFC 4180 CSV with UTF-8 encoding and LF line endings. Every CSV carries a 3–4 line #-prefixed header block with source label, export timestamp, DOI placeholder, license, and unit summary. Timestamps: ISO 8601 UTC with Z suffix. Sub-second precision on some Pandora scans. Units: SI throughout. Particulate matter in µg/m³; temperature in °C; pressure in hPa; wind speeds in m/s; precipitation in mm; solar radiation in W/m²; illuminance in lux; total column trace gases in mol/m². Spatial: Station locations as RFC 7946 GeoJSON, WGS84 / CRS84, in station_locations.geojson. Metadata schema: Dataverse Native JSON (citation + geospatial metadata blocks). Dataverse automatically re-emits this as schema.org Dataset, DDI Codebook, and Dublin Core for harvesting. Controlled vocabularies: Subject = "Earth and Environmental Sciences" (Dataverse-controlled); keywords from NASA GCMD; topic classification from LCSH. Unit conversions for convenience: Pandora NO₂ VCD × 6.022×1023 / 104 → molec/cm²; Pandora O₂ VCD × 2242 → Dobson Units. ♻ R — Reusable License: CC BY 4.0 — free to reuse with attribution. The license is decl

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