{"city":"Castro Valley","country":"United States","lat":37.69409942626953,"lon":-122.08634948730469,"range":"48h","license":"CC BY 4.0","source":"https://cerns.io","hourly":[{"datetime_utc":"2026-05-27T21:00:00Z","aqi":23,"aqi_min":6,"aqi_max":83,"pm25":5.37,"pm10":2.61,"stations":109},{"datetime_utc":"2026-05-27T22:00:00Z","aqi":23,"aqi_min":8,"aqi_max":79,"pm25":5.38,"pm10":3.3,"stations":107},{"datetime_utc":"2026-05-27T23:00:00Z","aqi":24,"aqi_min":9,"aqi_max":78,"pm25":5.71,"pm10":2.58,"stations":110},{"datetime_utc":"2026-05-28T00:00:00Z","aqi":25,"aqi_min":8,"aqi_max":74,"pm25":5.87,"pm10":4.15,"stations":109},{"datetime_utc":"2026-05-28T01:00:00Z","aqi":25,"aqi_min":6,"aqi_max":67,"pm25":6.03,"pm10":2.89,"stations":106},{"datetime_utc":"2026-05-28T02:00:00Z","aqi":29,"aqi_min":11,"aqi_max":153,"pm25":6.9,"pm10":4.53,"stations":113},{"datetime_utc":"2026-05-28T03:00:00Z","aqi":27,"aqi_min":11,"aqi_max":75,"pm25":6.5,"pm10":6.05,"stations":108},{"datetime_utc":"2026-05-28T04:00:00Z","aqi":27,"aqi_min":5,"aqi_max":58,"pm25":6.41,"pm10":3.81,"stations":109},{"datetime_utc":"2026-05-28T05:00:00Z","aqi":27,"aqi_min":12,"aqi_max":70,"pm25":6.51,"pm10":5.43,"stations":110},{"datetime_utc":"2026-05-28T06:00:00Z","aqi":27,"aqi_min":9,"aqi_max":67,"pm25":6.46,"pm10":3.79,"stations":108},{"datetime_utc":"2026-05-28T07:00:00Z","aqi":26,"aqi_min":10,"aqi_max":51,"pm25":6.26,"pm10":4.2,"stations":110},{"datetime_utc":"2026-05-28T08:00:00Z","aqi":26,"aqi_min":9,"aqi_max":57,"pm25":6.2,"pm10":4.02,"stations":113},{"datetime_utc":"2026-05-28T09:00:00Z","aqi":25,"aqi_min":10,"aqi_max":42,"pm25":5.9,"pm10":3.79,"stations":114},{"datetime_utc":"2026-05-28T10:00:00Z","aqi":22,"aqi_min":7,"aqi_max":38,"pm25":5.27,"pm10":2.38,"stations":106},{"datetime_utc":"2026-05-28T11:00:00Z","aqi":20,"aqi_min":4,"aqi_max":46,"pm25":4.78,"pm10":null,"stations":107},{"datetime_utc":"2026-05-28T12:00:00Z","aqi":18,"aqi_min":7,"aqi_max":30,"pm25":4.42,"pm10":null,"stations":107},{"datetime_utc":"2026-05-28T13:00:00Z","aqi":18,"aqi_min":9,"aqi_max":57,"pm25":4.38,"pm10":null,"stations":109},{"datetime_utc":"2026-05-28T14:00:00Z","aqi":16,"aqi_min":8,"aqi_max":36,"pm25":3.88,"pm10":null,"stations":109},{"datetime_utc":"2026-05-28T15:00:00Z","aqi":15,"aqi_min":4,"aqi_max":30,"pm25":3.61,"pm10":1.0,"stations":108},{"datetime_utc":"2026-05-28T16:00:00Z","aqi":15,"aqi_min":9,"aqi_max":85,"pm25":3.66,"pm10":null,"stations":107},{"datetime_utc":"2026-05-28T17:00:00Z","aqi":15,"aqi_min":10,"aqi_max":32,"pm25":3.47,"pm10":null,"stations":107},{"datetime_utc":"2026-05-28T18:00:00Z","aqi":15,"aqi_min":9,"aqi_max":53,"pm25":3.63,"pm10":null,"stations":105},{"datetime_utc":"2026-05-28T19:00:00Z","aqi":16,"aqi_min":9,"aqi_max":34,"pm25":3.78,"pm10":null,"stations":105},{"datetime_utc":"2026-05-28T20:00:00Z","aqi":17,"aqi_min":9,"aqi_max":67,"pm25":4.11,"pm10":null,"stations":108},{"datetime_utc":"2026-05-28T21:00:00Z","aqi":26,"aqi_min":22,"aqi_max":30,"pm25":6.19,"pm10":null,"stations":5},{"datetime_utc":"2026-05-28T22:00:00Z","aqi":57,"aqi_min":3,"aqi_max":102,"pm25":15.14,"pm10":1.5,"stations":6},{"datetime_utc":"2026-05-28T23:00:00Z","aqi":18,"aqi_min":9,"aqi_max":61,"pm25":4.24,"pm10":null,"stations":105},{"datetime_utc":"2026-05-29T00:00:00Z","aqi":17,"aqi_min":11,"aqi_max":24,"pm25":4.08,"pm10":null,"stations":101},{"datetime_utc":"2026-05-29T01:00:00Z","aqi":19,"aqi_min":3,"aqi_max":103,"pm25":4.54,"pm10":2.0,"stations":107},{"datetime_utc":"2026-05-29T02:00:00Z","aqi":19,"aqi_min":5,"aqi_max":60,"pm25":4.62,"pm10":1.48,"stations":112},{"datetime_utc":"2026-05-29T03:00:00Z","aqi":22,"aqi_min":8,"aqi_max":172,"pm25":5.27,"pm10":5.43,"stations":112},{"datetime_utc":"2026-05-29T04:00:00Z","aqi":19,"aqi_min":9,"aqi_max":42,"pm25":4.53,"pm10":4.35,"stations":108},{"datetime_utc":"2026-05-29T05:00:00Z","aqi":19,"aqi_min":8,"aqi_max":38,"pm25":4.54,"pm10":3.23,"stations":108},{"datetime_utc":"2026-05-29T06:00:00Z","aqi":20,"aqi_min":10,"aqi_max":59,"pm25":4.87,"pm10":3.48,"stations":112},{"datetime_utc":"2026-05-29T07:00:00Z","aqi":19,"aqi_min":9,"aqi_max":57,"pm25":4.62,"pm10":3.43,"stations":111},{"datetime_utc":"2026-05-29T08:00:00Z","aqi":19,"aqi_min":4,"aqi_max":35,"pm25":4.53,"pm10":4.51,"stations":110},{"datetime_utc":"2026-05-29T09:00:00Z","aqi":19,"aqi_min":5,"aqi_max":27,"pm25":4.53,"pm10":3.71,"stations":107},{"datetime_utc":"2026-05-29T10:00:00Z","aqi":20,"aqi_min":10,"aqi_max":34,"pm25":4.75,"pm10":6.74,"stations":109},{"datetime_utc":"2026-05-29T11:00:00Z","aqi":20,"aqi_min":9,"aqi_max":32,"pm25":4.78,"pm10":5.17,"stations":111},{"datetime_utc":"2026-05-29T12:00:00Z","aqi":21,"aqi_min":9,"aqi_max":53,"pm25":5.04,"pm10":6.64,"stations":107},{"datetime_utc":"2026-05-29T13:00:00Z","aqi":22,"aqi_min":7,"aqi_max":53,"pm25":5.16,"pm10":4.2,"stations":109},{"datetime_utc":"2026-05-29T14:00:00Z","aqi":22,"aqi_min":8,"aqi_max":54,"pm25":5.26,"pm10":4.41,"stations":109},{"datetime_utc":"2026-05-29T15:00:00Z","aqi":21,"aqi_min":9,"aqi_max":43,"pm25":4.95,"pm10":5.64,"stations":110},{"datetime_utc":"2026-05-29T16:00:00Z","aqi":19,"aqi_min":6,"aqi_max":56,"pm25":4.52,"pm10":2.28,"stations":108},{"datetime_utc":"2026-05-29T17:00:00Z","aqi":16,"aqi_min":9,"aqi_max":47,"pm25":3.85,"pm10":null,"stations":107},{"datetime_utc":"2026-05-29T18:00:00Z","aqi":15,"aqi_min":10,"aqi_max":66,"pm25":3.69,"pm10":null,"stations":107}],"daily":[{"date":"2026-05-27","aqi_avg":23,"aqi_min":23,"aqi_max":24,"aqi_color":"#059669","aqi_label":"Good","pm25_avg":5.5,"pm10_avg":2.8,"hours":3,"stations_avg":109},{"date":"2026-05-28","aqi_avg":23,"aqi_min":15,"aqi_max":57,"aqi_color":"#059669","aqi_label":"Good","pm25_avg":5.6,"pm10_avg":3.7,"hours":24,"stations_avg":100},{"date":"2026-05-29","aqi_avg":19,"aqi_min":15,"aqi_max":22,"aqi_color":"#059669","aqi_label":"Good","pm25_avg":4.6,"pm10_avg":4.2,"hours":19,"stations_avg":109}]}