openapi: 3.1.0
info:
  title: Air Quality Programmatic APIs Real-time Air Quality Tile Air Quality Programmatic APIs Real Time Air Quality Tile API Cities API
  description: API providing real-time air quality data as map tiles.
  version: 1.0.0
servers:
- url: https://tiles.aqicn.org/tiles
  description: Production server
tags:
- name: Cities
paths:
  /feed/{city}/:
    get:
      operationId: getAQIByCity
      summary: Air Quality Programmatic APIs AQICN Get AQI by City Name
      description: Retrieve real-time air quality data for a city by name. City names follow AQICN URL conventions (e.g., "beijing", "london", "new-york").
      tags:
      - Cities
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
      parameters:
      - name: city
        in: path
        required: true
        description: City name or station ID
        schema:
          type: string
        example: beijing
      - name: token
        in: query
        required: true
        description: API authentication token
        schema:
          type: string
        example: demo
      responses:
        '200':
          description: Air quality data for the city
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AQIStation'
              examples:
                getAQIByCity200Example:
                  summary: Default getAQIByCity 200 response
                  x-microcks-default: true
                  value:
                    status: ok
                    data:
                      aqi: 87
                      idx: 1451
                      city:
                        name: Shanghai, China
components:
  schemas:
    ForecastData:
      type: object
      description: Multi-day air quality and weather forecast
      properties:
        daily:
          type: object
          description: Daily forecasts by pollutant
          properties:
            pm25:
              type: array
              description: PM2.5 daily forecast values
              items:
                $ref: '#/components/schemas/ForecastDay'
            pm10:
              type: array
              items:
                $ref: '#/components/schemas/ForecastDay'
            o3:
              type: array
              items:
                $ref: '#/components/schemas/ForecastDay'
            uvi:
              type: array
              items:
                $ref: '#/components/schemas/ForecastDay'
    StationData:
      type: object
      description: Station data including AQI and pollutant readings
      properties:
        aqi:
          type: integer
          description: Overall Air Quality Index value
          example: 45
        idx:
          type: integer
          description: Station ID in AQICN database
          example: 8502
        city:
          $ref: '#/components/schemas/CityInfo'
        time:
          $ref: '#/components/schemas/TimeInfo'
        iaqi:
          $ref: '#/components/schemas/PollutantData'
        forecast:
          $ref: '#/components/schemas/ForecastData'
        attributions:
          type: array
          description: Data source attributions
          items:
            $ref: '#/components/schemas/Attribution'
    TimeInfo:
      type: object
      description: Timestamp information for the reading
      properties:
        s:
          type: string
          description: ISO 8601 timestamp of measurement
          example: '2025-04-19 10:00:00'
        tz:
          type: string
          description: Station timezone
          example: +08:00
        v:
          type: integer
          description: Unix timestamp
          example: 1745056800
    ForecastDay:
      type: object
      description: Single-day forecast value
      properties:
        avg:
          type: integer
          description: Average AQI for the day
          example: 52
        day:
          type: string
          description: Date string
          example: '2025-04-20'
        max:
          type: integer
          description: Maximum AQI for the day
          example: 78
        min:
          type: integer
          description: Minimum AQI for the day
          example: 31
    Attribution:
      type: object
      description: Data source attribution
      properties:
        url:
          type: string
          format: uri
          description: Attribution URL
          example: https://www.epa.gov/airnow
        name:
          type: string
          description: Data source name
          example: US EPA AirNow
    PollutantData:
      type: object
      description: Individual pollutant AQI values
      properties:
        pm25:
          type: object
          description: PM2.5 AQI reading
          properties:
            v:
              type: number
              example: 45
        pm10:
          type: object
          description: PM10 AQI reading
          properties:
            v:
              type: number
              example: 32
        no2:
          type: object
          description: Nitrogen dioxide AQI reading
          properties:
            v:
              type: number
              example: 12
        o3:
          type: object
          description: Ozone AQI reading
          properties:
            v:
              type: number
              example: 28
        so2:
          type: object
          description: Sulfur dioxide AQI reading
          properties:
            v:
              type: number
              example: 5
        co:
          type: object
          description: Carbon monoxide AQI reading
          properties:
            v:
              type: number
              example: 8
    AQIStation:
      type: object
      description: Air quality monitoring station with current readings
      properties:
        status:
          type: string
          description: Response status (ok or error)
          example: ok
        data:
          $ref: '#/components/schemas/StationData'
    CityInfo:
      type: object
      description: City and location information for the station
      properties:
        name:
          type: string
          description: City and station name
          example: Beijing, China
        url:
          type: string
          format: uri
          description: Station URL on AQICN
          example: https://aqicn.org/city/beijing/
        geo:
          type: array
          description: Geographic coordinates [latitude, longitude]
          items:
            type: number
          example:
          - 39.9042
          - 116.4074
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: query
      name: token
      description: API key for authentication