It’s no surprise that along with the wildfire ash, pollen, dust and other particles that can be found floating in the air we breathe, there are also fragments of genetic material from plants and animals. A new study by Canadian and British scientists reveals a novel way of harnessing that material to help track changes in the environment. Those genetic fragments that animals and plants shed through skin, scales, fur or excretion are known as environmental DNA (eDNA). They can give researchers clues to the biodiversity of an area by showing what creatures are present there more easily than other methods. The eDNA can be gathered by installing small air filters, similar to those used to cool computers and 3-D printers, directly in the habitats scientists want to monitor. Researchers found that there are gadgets monitoring air pollution all around us that have already inadvertently been collecting eDNA on a large scale for decades.