What measures can governments implement to improve air quality?

Establishing stricter emission standards and promoting sustainability is an effective measure for governments to improve air quality. Stricter emission standards limit the amount of pollutants that industries and vehicles can release into the atmosphere, leading to a significant reduction in air contaminants such as nitrogen oxides, sulfur dioxide, particulate matter, and volatile organic compounds. These standards ensure that both existing and new sources of pollution operate within safe and sustainable limits, contributing directly to cleaner air.

Promoting sustainability involves encouraging practices and technologies that reduce environmental impact, such as renewable energy sources, energy efficiency, and sustainable transportation options. By shifting towards these cleaner alternatives, governments can decrease reliance on fossil fuels and minimize harmful emissions associated with their combustion. This comprehensive approach not only addresses current air quality issues but also works towards long-term solutions that protect public health and the environment.

The other options, while potentially having some effects on air quality, do not effectively target the reduction of pollutants or promote a long-term sustainable framework for future air quality improvements.