Get the most recent time series (hourly or daily aggregates) for a single OpenAQ sensor (sensor id from find_stations), newest first. Use for pollutant trends over time at one station/parameter. Returns the sensor's LAST `limit` readings — note that many OpenAQ sensors are archived and stopped reporting years ago, so "most recent" can legitimately be several years old: always read the returned timestamps rather than assuming the data is current. Use find_stations or get_latest to pick a sensor that is still reporting.
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