The Carl Moyer Rural Assistance Program provides grants to individuals, businesses, and public agencies for voluntarily upgrading heavy-duty engines and vehicles beyond what air quality regulations require. Eligible projects include repowers, retrofits, and cleaner replacements for certain off-road, on-road, and stationary agricultural equipment, with grants of up to $100,000 based on incremental cost and emissions benefits. Projects are ranked by cost effectiveness and administered through the local air quality district.