How do you have fresh air in the city if we don't have plants?

Fresh air in cities without plants can be maintained through various methods, such as implementing air purification systems, using green building technologies, and increasing the use of electric vehicles to reduce emissions. Additionally, urban planners can create green roofs, vertical gardens, and community parks, which can contribute to air quality even in limited spaces. Regular monitoring of air quality and enforcing strict pollution regulations are also essential for ensuring cleaner air. Ultimately, a combination of technology and strategic urban design can help improve air quality in urban environments.