An act relating to prohibiting the emission of excessive soot or smoke from certain motor vehicles

H 48 prohibits vehicle owners and operators from installing aftermarket devices that increase soot or smoke emissions or modifying exhaust systems to enhance such emissions. It also bans purposefully releasing visible soot, smoke, or particulates from vehicles. Violations carry civil penalties of up to $500 for a first offense and up to $1,000 for repeat offenses. The bill amends Vermont statutes (10 V.S.A. § 567 and 23 V.S.A. § 1221) and takes effect July 1, 2025. It directly affects vehicle owners, mechanics, and operators of modified vehicles.