The bill proposes to extend the deadline for reducing class sizes in city schools with a population over one million, from 2028 to 2030. It outlines specific class size limits for different grade levels and sets annual compliance targets, with exemptions for space, over-enrolled students, teacher shortages, and economic distress. The plan prioritizes schools with higher poverty levels and clarifies the process for determining exemptions. If passed, the bill will impact the education system, potentially influencing classroom sizes and academic environments in city schools.