Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good Air Quality Primer, Seconded

The review I was going to write is almost exactly like the first review posted giving it 4 stars, so I will just second everything mentioned. Good air quality primer for the environmental professional, but if you are already an air quality scientist or specialist, you may find it a little basic. Excellent overall quality and information on all the air quality issues affecting North America today.