The phrase suggests a promotional offering related to smog reduction efforts during periods of clear weather. It alludes to an incentive program, potentially a discount or rebate, designed to encourage individuals or businesses to take actions that mitigate air pollution under sunny conditions. An example might be a reduced price on electric vehicle charging or a subsidized smog check.
Initiatives of this nature are significant because they target pollution mitigation during times when conditions exacerbate the formation of smog. Clear, sunny skies often coincide with increased photochemical reactions, leading to higher concentrations of ground-level ozone and other pollutants. By incentivizing smog-reducing behaviors during these periods, a potentially positive impact on air quality and public health can be realized. Historically, such incentives have been implemented to address specific air quality challenges in regions prone to smog.