Table 1.

Literature search strategy for PubMed and number of identified articles.

1	“asthma” [MeSH Terms] OR “asthma” [All Fields] OR (“chronic” [All Fields] AND “respiratory” [All Fields] AND “disease” [All Fields]) OR “chronic respiratory disease” [All Fields] OR “asthma” [Mesh]	223989
2	“hospitalization” [Mesh] OR “emergency service, hospital” [Mesh] OR ((“hospitals” [MeSH terms] OR “hospitals” [All fields] OR “hospital” [All fields]) AND admission [All fields]) OR (“length of stay” [MeSH terms] OR (“length” [All fields] AND “stay” [All fields]) OR “length of stay” [All fields] OR (“hospital” [All fields] AND “stay” [All fields]) OR “hospital stay” [All fields]) OR ((“hospitals” [MeSH terms] OR “hospitals” [All fields] OR “hospital” [All fields]) AND admissions [All fields]) OR (“length of stay” [MeSH terms] OR (“length” [All fields] AND “stay” [All fields]) OR “length of stay” [All fields] OR (“hospital” [All fields] AND “stays” [All fields]) OR “hospital stays” [All fields]) OR exacerbation [All fields] OR exacerbations [All fields]	481723
3	“weather” [Mesh] OR meteorological [All fields] OR (“weather” [MeSH terms] OR “weather” [All fields]) OR (“temperature” [MeSH terms] OR “temperature” [All fields]) OR (“humidity” [MeSH terms] OR “humidity” [All fields]) OR (“wind” [MeSH terms] OR “wind” [All fields]) OR (“rain” [MeSH terms] OR “rain” [All fields]) OR (“snow” [MeSH terms] OR “snow” [All fields]) OR precipitation [All fields] OR thunder [All fields] OR (“lightning” [MeSH terms] OR “lightning” [All fields]) OR storm [All fields] OR (“cyclonic storms” [MeSH terms] OR (“cyclonic” [All fields] AND “storms” [All fields]) OR “cyclonic storms” [All fields] OR “Hurricane” [All fields]) OR (“tornadoes” [MeSH terms] OR “tornadoes” [All fields] OR “tornado” [All fields]) OR (“droughts” [MeSH terms] OR “droughts” [All fields] OR “drought” [All fields]) OR “meteorological concepts” [Mesh] OR (“atmosphere” [MeSH terms] OR “atmosphere” [All fields]) OR atmospheric [All fields] OR “air pressure” [All fields] OR (“climate” [MeSH terms] OR “climate” [All fields]) OR (“seasons” [MeSH terms] OR “seasons” [All fields]) OR seasonal [All fields] OR “thunderstorm” [All fields] OR thunderstorms [All fields]	1298001
4	1 AND 2 AND 3	1631
5	4 AND publication date to Nov. 17, 2017	1511
6	4 AND publication date Nov. 17, 2017–Dec. 31, 2018	120