Question

21 a community wants to reduce air pollution and its harmful health effects. which strategy would have an immediate positive effect? holding a community - education fair in the park waiving bus fares on days when air pollution is severe planting trees on unused public lands running ads encouraging people to bicycle to school and work

Explanation:

Step1: Analyze each option

• Holding a community - education fair: It mainly raises awareness but no immediate reduction in pollution.
• Waiving bus fares on severe pollution days: Encourages more people to use public transport instead of personal vehicles (which emit pollutants). This can immediately reduce the number of polluting vehicles on the road.
• Planting trees: Trees take time to grow and purify air, no immediate effect.
• Running ads to encourage bicycling: Ads may take time to influence people's behavior, not an immediate solution.

Answer:

waiving bus fares on days when air pollution is severe