Recently, I experienced a wonderful lesson in how little things still mean a lot. My brother, mother and I live in a very rural district of Hawaii. Our farm is at least a dozen miles from the most basic of services. Therefore, I take weekly trips to COSTCO to get supplies. About a month ago, I finished loading up the car and was about to leave, when a piece of paper caught my eye. I picked it up and read it carefully.

    It was a receipt(收据) from the State Motor Vehicle Division, recording the owner's payment of her Vehicle's Registration fees. At first I thought that I could find the owner. So I waited there for about an hour. Although the receipt had been borne (由……携带) on the wind, where in the busy, crowded parking lot would I find the owner? I looked over the receipt for contact or any personal data, perhaps a license tag(牌照)or telephone number. I checked the date, the fees paid, noted the name of the owner and pocketed the paper. I concluded that the best and easiest step to take was to put the receipt in an envelope and send it to the owner first the next morning.

    By the end of the week, I received a beautiful thank-you letter from a very grateful and happy woman containing a handwritten message and a gift card. In the letter, the woman explained how the wind snatched(夺去) her receipt from a pocket in her car's passenger door. She had searched everywhere for quite some time before giving up.

    It felt great to know I'd helped someone avoid a loss by doing something that at first glance(一瞥) seemed little or even unimportant.

结合材料，回答下列问题：

材料一：为保护和改善环境，防治大气污染，保障公众健康，推进生态文明建设，新修订的《中华人民共和国大气污染防治法》已于2016年1月1日起正式施行。该法规定：县级以上地方人民政府应当依据重污染天气的预警等级，停止幼儿园和学校组织的户外活动。

材料二：苏州市政府颁布的《苏州市大气重污染应急预案》规定：如果在未来2天内持续出现不利气象条件，可能出现大气重污染的情况或已出现大气重污染时，苏州将启动苏州市大气重污染应急预案。二级预警时，中小学和幼儿园停止户外活动，一级预警时，建议中小学和幼儿园停课。