Environmental Monitoring Network¶
Technical documentation and development log for Saladillo's environmental monitoring network, Buenos Aires: three sibling portals that share the same Cloudflare infrastructure (Pages + Workers + D1) and the same design system (design.lemeit.ar).
Since September 2026 all three live under a single domain, app.lemeit.ar, with a path prefix per portal — a gateway Worker (repo gateway) reverse-proxies each one to the Cloudflare Pages project that still publishes it, unchanged. The old domains (aq/emas/wq.lemeit.ar) keep working, they just redirect to the new domain on their own.
| Portal | Domain | What it measures | Repo |
|---|---|---|---|
 School Air Quality Monitoring |
app.lemeit.ar/aq | Air quality (PM1.0/PM2.5/PM10, VOC, CO2, NOx) — PurpleAir and AirGradient sensors in educational institutions across Buenos Aires Province | lemeit-aq |
 EMAS |
app.lemeit.ar/emas | Weather — temperature, humidity, pressure, wind, rain from automatic stations in Saladillo and 25 de Mayo | lemeit-emas |
 Water Quality |
app.lemeit.ar/wq | Arsenic, nitrates, fluoride, heavy metals and bacteriology from the municipal water network | lemeit-wq |
Project origin¶
It all starts in 2023, when Luciano Lamaita was selected as a Community Ambassador for the OpenAQ Community Ambassadors program. That's where the first low-cost sensors installed in Saladillo came from (AirGradient, Clarity Node-S, Atmotube), along with the citizen-science project "Saladillo Schools in Action for Clean Air," presented at school science fairs and technology expos.
Integrating that work into a dedicated portal came later, in March 2026, as an educational project of the Industrial Laboratory course, 7th-year Chemical Technician track, EEST N°1 "Gral. Savio" (Saladillo, Buenos Aires), led by Eng. Luciano Lamaita. The starting point was getting programmatic access to the school's own Automatic Weather Station (EMA) data — that's how EMA Saladillo came about, later expanded into a network of 4 stations. In August 2026 the three projects (weather, air, water) were harmonized onto the same Cloudflare architecture so they could eventually integrate with each other. See the project log (Spanish only) for the full history.
Shared architecture¶
All three portals follow the same pattern:
- Ingestion: Python scrapers (GitHub Actions or a Cloudflare Cron Trigger) that write to a project-specific Cloudflare D1 database.
- API: a Cloudflare Worker per project exposes that database as a REST API — public, read-only, no authentication, open CORS (plus protected ingestion/admin endpoints where relevant). See each portal's page for endpoint details and usage examples.
- Dashboard: a static
index.html(vanilla HTML/CSS/JS, no build step or framework) that queries the Worker viafetch(), published on Cloudflare Pages. - Design: shared palette, typography (JetBrains Mono) and components (header, portal switcher, versioned footer) via design.lemeit.ar (
lemeit-theme.css+lemeit-common.js). - Maps: CARTO Basemaps tiles served through the Worker's own proxy, so the API key is never exposed in the public HTML.
See the project log (Spanish only) for the session-by-session history, including the microclimate analysis (urban heat island effect at EMA-CS) done with the first 4 stations' data.
Access from Lemeit¶
Lemeit now links directly to Aire Escolar, weather and water-quality portals. This is a navigation update; sensors, ingestion, databases and APIs were not changed. Portal and identity record.