KnowAir Air Quality — Station-Based AQI Forecast
Query comprehensive air quality forecasts from monitoring stations with up to 15-day coverage using the Caiyun Weather API.
Prerequisites
- A valid Caiyun Weather API token set as
CAIYUN_TOKENenvironment variable, or stored in~/.config/knowair/token. - Coordinates (longitude, latitude) for the target location.
Quick Start
python3 scripts/query_air_quality.py --lng 116.3176 --lat 39.9760
Workflow
- Resolve coordinates — convert city name to coordinates if needed.
- Run the script:
python3 scripts/query_air_quality.py --lng <LNG> --lat <LAT> - Present results — summarize current AQI level, pollutant trends, best/worst periods, and health advice.
Options
| Flag | Description | Default |
|---|---|---|
--lng | Longitude (-180 to 180) | Required |
--lat | Latitude (-90 to 90) | Required |
--hours | Forecast hours (1-360) | 120 |
--detail-level | Display density 0-6 (0=auto) | 0 |
--lang | Output language: en or zh | en |
Defaults
- Hours: 120 (5 days)
- Detail level: auto (0)
- Language:
en
Failure Handling
- Missing token → exit code 2 with setup instructions.
- API error → exit code 1 with error details.
- Station data unavailable → falls back to API forecast data.