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How to Read an Air Quality Update
An air-quality index is a useful starting point, not a full account of what is in the air. Here’s how to read the terms, check the source and understand what a snapshot can—and cannot—tell you.
An air-quality index is a useful starting point, not a full account of what is in the air. Here’s how to read the terms, check the source and understand what a snapshot can—and cannot—tell you.