Validation of MAX-DOAS retrievals of aerosol extinction, SO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;, and NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; through comparison with lidar, sun photometer, active DOAS, and aircraft measurements in the Athabasca oil sands region
Atmospheric measurement techniques