Summary: The text discusses how the COVID-19 pandemic has highlighted the importance of clean air and sustainable transportation in cities. As lockdowns lead to reduced emissions and improved air quality, there is a growing need to prioritize sustainable practices such as biking, walking, and public transportation to maintain these benefits post-pandemic. It also emphasizes the role of urban planning in creating pedestrian-friendly environments and reducing car usage to combat climate change and improve public health. Initiatives like car-free zones, bike lanes, and green spaces can contribute to a more sustainable and livable urban landscape, ultimately fostering healthier and more resilient cities in the face of future challenges.