There is no evidence, howeven, that outdoor air pollution is an initiating cause of asthma. 然而,没有明显证据表明室外空气污染是哮喘病的最初起因。
The external air temperature can be measured by a simple external air sensor and a PC can continuously register and average them. 室外气温可以用一个简易的室外空气传感器测量,计算机可以连续记录并进行平均值计算。