“Can Column Formaldehyde Observations Inform Air Quality Monitoring Strategies for Ozone and Related Photochemical Oxidants?”

Aircraft campaign at Seoul and Long Island Sound show the correlation between HCHO column and surface ozone, which could be useful for informing ozone monitoring strategies.

In Seoul, high NO2 leads to a better Ox-HCHO correlation than ozone-HCHO correlation. So HCHO column-Ox relationship can reflect the sum of surface ozone and related photochemical oxidants.

This relationship shifts during the campaign period in Seoul, indicating that the long term stability of the HCHO-Ox relationship needs evaluation.