Given the regulatory process and the range regulatory strategies (i.e. Command & Control, Incentives, Market harnessing controls, Competition laws, Franchising, Contracting, Tradable Permits, Disclosure, Direct Interventions, Nudge strategies, Rights & Liabilities Laws. & Public Compensation/Social Insurance), what would be the best regulatory approach to best deal with improving indoor air pollution in the United States now that more people are staying indoors?