Long-term exposure to air pollution and COVID-19 incidence: a prospective study of residents in the city of Varese, Northern Italy.

"to assess completeness of case ascertainment in our sample we compared the trend in the weekly number of covid-19 cases in our data with the weekly number of cases in the lombardy region as available on the data repository operated by the johns hopkins university centre for systems science and engineering (jhu csse; https://github com/cssegisanddata/covid-19 )."

"to assess completeness of case ascertainment in our sample we compared the trend in the weekly number of covid-19 cases in our data with the weekly number of cases in the lombardy region as available on the data repository operated by the johns hopkins university centre for systems science and engineering (jhu csse; https://github com/cssegisanddata/covid-19 )."

"Competing interests: None declared."

"Funding: The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors."