Development of a portable cavity-enhanced absorption spectrometer for the measurement of ambient NO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; and N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O&amp;lt;sub&amp;gt;5&amp;lt;/sub&amp;gt;: experimental setup, lab characterizations, and field applications in a polluted urban environment
Atmospheric measurement techniques