Many Bay Area residents care deeply about climate change but struggle to identify meaningful actions beyond basic habits, while local policymakers lack accessible tools to evaluate county-level policy effectiveness. In partnership with Act Now Bay Area, our team is developing an interactive climate dashboard that translates complex greenhouse gas data from sources like CARB and BAAQMD into clear, localized insights for two audiences: the general public and county-level policymakers. The dashboard features a dual-mode interface — a Simple Mode that connects emissions data to relatable everyday actions, and an Expert Mode with historical trend analysis, county comparisons, and a policy simulator that models the projected impact of interventions like building electrification and EV infrastructure expansion. Our design decisions are grounded in primary research including expert interviews with urban planners, climate scientists, and data communication specialists, as well as a community survey of over 60 Bay Area residents.