The American Chemical Society (ACS) is hosting ACS Fall 2025 virtually and in Washington, D.C., on August 17–21 at the Walter E. Washington Convention Center. Cutting-edge developments on a range of scientific topics will be featured at the meeting.

Per- and polyfluoroalkyl substances (PFAS), or forever chemicals, are being identified in more places. Period products are on that list, likely because of the resistance to stains and liquids conferred by these chemicals. Building on previously presented research, a team publishing in ACS’ Environmental Science & Technology Letters found that some reusable products, namely period underwear and reusable pads, contained PFAS, which might be absorbed into the body through skin contact.

In early 2025, wildfires spread in Los Angeles, destroying tens of thousands of homes and businesses. During the fires, smoke blanketed the region and online maps provided residents with rapid air quality information. Now, a study in ACS’ Environmental Science & Technology Letters compares the data that went into the maps from federal monitoring stations, low-cost sensors and satellites. Their results highlight the importance of combining multiple data sources to form easily accessible information for the public.