Since 2023, Emerald Keepers has been monitoring and publishing data on Coronado’s air quality. The information is gathered from four air-quality monitors Emerald Keepers installed around Coronado, which provide information on the local Air Quality Index (AQI).

An analysis of Coronado’s 2025 air quality from January through October shows 29% of days with unhealthy air at the Shores. The monitor at 1st Street shows 20% of the days with unhealthy air, and the Coronado Cays monitor reported 14% of days unhealthy.

MORE MONITORS NEEDED

To better understand air-quality trends, Emerald Keepers is looking for up to four additional homeowners to host an air-quality monitor on their property. Neighborhoods with the greatest need for monitors include the area between 10th Street and Ocean Avenue an

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