People exposed to higher levels of air pollution before the pandemic are likely to have lower antibody responses to Covid-19 vaccines, suggests a study. Researchers from Barcelona Institute for Global Health and the Germans Trias i Pujol Research Institute in Spain say that exposure to fine particulate matter, nitrogen dioxide, and blank carbon are associated with about a 10 per cent decrease in IgM and IgG antibody responses in people without prior infection. , Health News, Times Now