Environment — Chart: Pollutant Sources

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "description": "Sources of NOx emissions",
  "data": {"values": [
    {"source": "Road transport", "share": 33},
    {"source": "Energy production", "share": 22},
    {"source": "Industry", "share": 18},
    {"source": "Shipping", "share": 14},
    {"source": "Other", "share": 13}
  ]},
  "mark": "arc",
  "encoding": {
    "theta": {"field": "share", "type": "quantitative"},
    "color": {"field": "source", "type": "nominal", "title": "Source"}
  }
}