We wanted to understand the air quality around our school site, so that we can use this as a way to encourage the rest of the school to get involved in active travel and the travel activities we will run this year. We conducted two types of experiments around the school site where we investigated the type and quantity of lichen on trees and looked at particle matter at different locations around the school. Students found that there were higher levels of particulate matter in more densely populated areas of the school, for example near the entry gates where parents drop off students. This means that the air is more polluted, perhaps due to the traffic and the higher circulation of air. There were also more nitrogen sensitive lichen around the school playground, such as Hypogymnia, showing that nitrogen levels in the school were lower in areas further away from the roads. Next, students will write an article to highlight how our travel choices affects air quality