Air quality CLI and the Rust/WASM core behind Air Signal and Crew Air: 14 outdoor signals, pollution fronts, EPA NowCast, Open-Meteo and Sensor.Community data merged.

Check AQI, PM2.5 and PM10 for any city from the terminal, no API key: airq --city tokyo. The same core, compiled to WebAssembly, runs Air Signal and Crew Air.

Two sources, merged by disagreement. Sensor.Community’s ~15,000 citizen sensors are the ground truth, the CAMS model via Open-Meteo the fallback; the more they diverge, the less the model counts.
More than one number. A comfort index from 14 signals, history sparklines, pollution front detection (cross-correlation with time lag), and source attribution that finds factories, power plants and highways in OpenStreetMap and checks which wind direction brings the PM2.5.
Crew plans. crew.rs computes the EPA NowCast and the Cal/OSHA smoke and heat steps per hour, with the rules kept as JSON rulebooks.
Reports and a server. HTML/PDF reports with a map and heatmap, and airq serve, a REST API with Swagger UI that also ingests ESP8266/ESP32 sensors.
Every command has --json. Install with brew install fortunto2/tap/airq or cargo install airq.
Source: github.com/fortunto2/airq (Rust, AGPL-3.0) · crates.io/crates/airq
How it was built: rustman.org/projects/project-airq