While nitrogen dioxide
 vertical column concentrations above central and eastern Europe and
 parts of the East Coast of the United States have been either static or
 exhibiting a small decrease, there is a clear and significant increase
 over China,  -   John Burrows     Quotes
While nitrogen dioxide vertical column concentrations above central and eastern Europe and parts of the East Coast of the United States have been either static or exhibiting a small decrease, there is a clear and significant increase over China, John Burrows
 China East Coast United States