Guidelines & Tools C40 Air Quality through Urban Action (AQUA): Technical Document Published 2023 Share SHARE Facebook share Twitter LinkedIn Copy URL Email Download Download p en fr es zh-hans Added on: 20 May, 2025 Breadcrumb Home Resource Library C40 Air Quality Through Urban Action (AQUA): Technical Document The AQUA tool is an easy-to-use excel spreadsheet model that city staff can use with minimal guidance. It uses population, exposure, health and economic cost data, as well as epidemiologic evidence to help users calculate how emission changes can benefit local air quality and health.