On each sampling day, air samples were collected every hour during the daytime (7 a.m. to 7 p.m.) and every 2 hours at night (7 p.m. to 7 a.m.) until the next morning
On each sampling day, air samples were collected every hour during the daytime (7 a.m. to 7 p.m.) and every 2 hours at night (7 p.m. to 7 a.m.) until the next morning