What's going on with the air quality in Boston today?

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Although there are no forest fires in our area, the air quality has been reduced to an unhealthy level this morning in some parts of Massachusetts due to a thermal inversion to the surface. This can happen in several ways. Normally, temperatures decrease with the height in the atmosphere, where the coldest air is in height. A thermal inversion occurs when conditions are reversed, where the warmest air is just above us and the coldest air on the …