If they think of the full moon, no. On the other hand, summer asthma (irritative action some ozone) is known. A physical activity by cold and dry time favours asthma attacks, phenomenon noticed at the thorough skiers, the skaters, the players of ice hockey To others, it is the fog which will be damaging.
Other circumstance of strict asthma, storms happening after a period of fine weather: they disperse and shred the grains of pollens by casting them on the hard surfaces (trees, walls, soil). It liberates allergisantes particles very fine which deeply enter the lung and launch true epidemics of serious sharp asthma. Asthmatic allergic in pollens have to be wary of the storm!
published in www.medecine-et-enfance.net