While asthma has a large impact—including being the most common reason for school absence—data on the disease can be difficult to collect. An app called Propeller has been developed which tracks medication use among people with asthma and analyzes usage against 30 different environmental factors that can impact air quality and respitory health.

Air pollution is a huge problem for China, but surprisingly, the Air Quality Index in several cities is improving because of a variety of experimental projects that are being rolled out and a number of clever pollution solutions from around the country.

CityTree doesn't resemble the typical tree, but it provides the environmental benefit of 275: this structure, designed for urban landscaping by "Green City Solutions," filters air, cools the surrounding environment and removes CO2 and harmful air pollutants. As climate change worsens our air quality, these structures have proven to monitor and combat the air pollutants in cities all over the world.