Measurements and model comparisons suggest that HONO is not an important source of OH radical concentrations below a rural forest canopy

Key Points

• The aim is to determine the importance of HONO as a source of OH radicals below a forest canopy.
• Conducted measurements of HONO concentrations below a rural forest canopy.
• Utilized a model that incorporates known HONO sources and sinks.
• Compared HONO levels below the canopy to those above it.
• Measured HONO concentrations were similar to those observed above the canopy.
• HONO was not found to be a significant source of OH radicals in the studied area.
• Model comparisons supported the measured data, indicating model accuracy.