Above are the annual average no2nbspconcentrations at sites


Above are the annual average NO2 concentrations at sites in downtown Boston and Los Angeles.

What are the sources of NO2 in the urban atmosphere?

Why is there a decreasing trend of NO2 concentrations in both graphs? How do they compare?

Compare and contrast the air quality in Boston and Los Angeles. If you were to claim that Boston has better air quality than Los Angeles, provides some evidence and explain why.  (Hint: Do some research. Consider more than just the 2 graphs of NO2 above.)

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Macroeconomics: Above are the annual average no2nbspconcentrations at sites
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