Just recently in the newspaper La Nacion there was an article about Coronado. The article was saying how fresh and clean the air was in Coronado. They mentioned that it was actually fresher than the air quality in Escazu.
I would agree that the air is fresh and clean in Coronado, it is also clean in Escazu. This is due to less traffic than the city of San Jose and it is at a higher altitude and the air pollution tends to settle down in San Jose. Also the higher altitudes make the air cooler so it feels fresh. In both Coronado and Escazu you have fantastic views at night looking down into San José and seeing all the lights.
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