印第安纳州印第安纳波利斯空气质量警报：10月28日晚6时至29日上午10时PM2.5升高，敏感人群宜减少户外活动
印第安纳州马里恩县印第安纳波利斯市消息：印第安纳波利斯市10月28日发布本地空气质量提示（Knozone Advisory），有效期为10月28日晚6时至10月29日上午10时：细颗粒物PM2.5预计将升至对所有人都不健康的水平，敏感人群应尽可能留在室内。
这是该市本周连续第二次发布空气质量提示。印第安纳州环境管理厅的本地空气质量提示指出，印第安纳中部天气静止，近地面空气层与微风预计将在夜间滞留污染物，使PM2.5浓度升高。市政府建议敏感人群——包括儿童、户外劳动者以及患有心脏与肺部疾病者——在提示期内尽量留在室内。
市政府还建议居民关闭门窗、运行空调或空气净化器，乘车时使用内循环以减少室外空气暴露。居民可通过美国环境保护署与州环境管理厅查看最新空气质量信息，并可在smogwatch.in.gov登记接收警报通知。
来源：GSM·美国
Indianapolis Air Quality Advisory: PM2.5 Levels Elevated From 6 P.M. Oct. 28 to 10 A.M. Oct. 29
INDIANAPOLIS, Marion County, Indiana — The City of Indianapolis issued a Knozone Advisory from 6 p.m. Oct. 28 to 10 a.m. Oct. 29, as fine particulate matter, PM2.5, is expected to rise to levels unhealthy for everyone for several hours. Individuals in sensitive groups — including children, outdoor laborers and people with heart and lung illnesses — are advised to remain indoors as much as possible during the advisory.
It is the city's second consecutive air quality advisory this week, following stagnant weather conditions in Central Indiana. A layer of air close to the ground and calm overnight winds could trap pollution and cause PM2.5 to rise, according to the Indiana Department of Environmental Management's local air quality advisory.
City officials also recommend keeping windows closed, running an air conditioner or purifier, and recirculating air inside vehicles to reduce exposure. Updated air quality information is available from the U.S. Environmental Protection Agency and the Indiana Department of Environmental Management, and residents can sign up for alerts through smogwatch.in.gov.
Source: GSM·USA
来源：GSM·美国（原文链接）
图片来源：图：Downtown Indy Skyline.jpg（CC BY 4.0，Wikimedia Commons）。Photo: Downtown Indy Skyline.jpg (CC BY 4.0, via Wikimedia Commons).
