How does urban green space affect air quality?

Urban green space plays a significant role in improving air quality, making the assertion that it decreases air pollution correct. Green areas such as parks, gardens, and trees contribute to cleaner air by acting as natural air filters. Plants engage in photosynthesis, absorbing carbon dioxide and releasing oxygen, while also trapping particulate matter and other pollutants on their leaves and surfaces. This process can lead to reduced levels of harmful substances in the air.

Additionally, urban vegetation can help in cooling the surrounding environment, which may reduce the formation of ground-level ozone, a significant air pollutant. By improving air quality, urban green spaces not only enhance the health of residents but also contribute to a more sustainable urban ecosystem.

The other options do not align with the established benefits of urban green spaces. They either suggest a lack of impact or indicate negative environmental effects that are typically not associated with the presence of green spaces. Instead, urban greenery is recognized for its positive contributions to air quality and overall urban health.