The article "Air Pollution XXII" covers various aspects of air pollution, including modeling, monitoring, aerosols, exposure, health effects, and emission studies. Researchers studied air quality, climate change, and resilience in Porto, Portugal, as well as volcanic ash dispersion in Ecuador. They also looked at carbonaceous aerosols in Thailand, metal pollution in the air, and mutagenicity levels in Rio de Janeiro. The study also examined the effects of air pollution on asthma hospitalizations and the environmental burden of PM2.5 exposure in Poland. Additionally, researchers investigated pollution dispersion in Geneva, dust emissions, CH4 fluxes over the Iberian Peninsula, nitrogen compound conversion during combustion, and air pollutants emissions from cattle in Spain. The goal was to understand various aspects of air pollution and its impact on the environment and human health.