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Total radical production, p(HOx), (black dashed line) and individual contributions by photoloysis of ozone followed by the reaction of O1D with water vapor (blue line), formaldehyde photolysis (red dotted line), and HONO photolysis (green line) for a) January-13 March (pre-lockdown), b) 14 March–April (post-lockdown), and c) Test simulation with reduced-NOx (post-lockdown levels) and pre-lockdown VOCs levels.
