数百万美国人警惕着有害健康的空气质量如同烟来自邻国加拿大的野火漂流到美国.
今年到目前为止，加拿大各地的野火已经烧毁了创纪录的2000万英亩，而且看不到结束的迹象。根据加拿大跨部门森林火灾中心的数据，目前全国有500处活跃的野火，超过250处被认为已经失控。烟雾已经向美国蔓延了一个多月。
21个州的空气质量警报
周四下午，随着加拿大野火烟雾渗入中西部、东北部和南部部分地区，空气质量警报在21个州生效。
匹兹堡空气质量“非常不健康”，MLB奥运会推迟
周四下午，匹兹堡的空气质量指数攀升至231，属于“非常不健康”的类别。对于敏感人群来说，任何超过100的数字都被认为是不健康的。
据美联社报道，由于空气质量差，周四下午在匹兹堡举行的MLB海盗队和圣地亚哥教士队的比赛推迟了45分钟。
匹兹堡市长埃德·盖尼鼓励居民周四待在室内。
纽约将推出空气质量电话预警
纽约州州长凯西·霍楚尔(Kathy Hochul)周四表示，纽约将推出电话警报，提醒居民在空气质量不佳的情况下采取预防措施。
罗切斯特和布法罗的空气质量指数目前处于“不健康”类别。
“事实是，看不到尽头，”Hochul在新闻发布会上说，并指出这种情况可能会在整个夏天断断续续地存在。“这是纽约人的新常态。”
在空气质量指数超过200一小时或更长时间的地区，将会发出电话警报。公共交通上也将发布公告，届时将分发数十万个口罩。
Hochul说，现在了解7月4日假期的空气质量还为时过早。
“我们不知道未来几天会发生什么——今天会很糟糕，明天也会很糟糕。我们预计在接下来的几天里风力会开始减弱。我们现在不可能预测节日庆祝活动，”她说。
杰基·布雷，纽约国土安全和紧急服务部门的专员，补充说"今天保持游泳池开放是完全合适的，人们外出是完全合适的，只要他们不属于这些敏感群体。"
俄亥俄州哥伦布市遭遇有史以来最糟糕的空气质量
俄亥俄州哥伦布市周四上午的空气质量指数达到244，是该市有史以来的最高值。
空气质量指数已经下降到169。对于敏感人群来说，任何超过100的数字都被认为是不健康的。
Wildfire smoke live updates: MLB game delayed amid Pittsburgh's poor air quality
Millions of Americans are on alert forunhealthy air qualityassmokefrom wildfires in neighboring Canadadrifts to the United States.
Wildfires have burned a record of 20 million acres across Canada so far this year, with no end in sight. There are currently 500 active wildfires throughout the country and more than 250 have been deemed out of control, according to the Canadian Interagency Forest Fire Center. The smoke has been making its way to the U.S. for over a month.
Air quality alerts in 21 states
Air quality alerts are in effect in 21 states Thursday afternoon as the Canadian wildfire smoke infiltrates the Midwest, Northeast and parts of the South.
Pittsburgh air quality 'very unhealthy,' MLB game delayed
The Air Quality Index in Pittsburgh climbed to 231 Thursday afternoon, which falls under the "very unhealthy" category. Any number over 100 is considered unhealthy for sensitive groups.
Thursday afternoon's MLB game in Pittsburgh between the Pirates and San Diego Padres was delayed 45 minutes due to the poor air quality, according to The Associated Press.
Gene J. Puskar/AP
With the baseball game between the Pittsburgh Pirates and the San Diego Padres delay...
Pittsburgh Mayor Ed Gainey is encouraging residents to stay inside on Thursday.
New York to roll out air quality phone alerts
New York will be rolling out phone alerts to remind residents to take precautions amid the poor air quality, Gov. Kathy Hochul said Thursday.
The Air Quality Index is currently in the "unhealthy" category in Rochester and Buffalo.
"The truth is, there is no end in sight," Hochul said at news conference, noting the conditions could linger off and on through the summer. "This is the new normal for New Yorkers."
Phone alerts will be sent in areas where the Air Quality Index is above 200 for one hour or longer. Announcements will also be made on mass transit, where hundreds of thousands of masks will be handed out.
Hochul said it is too early to know about the air quality over the July 4 holiday.
“We don't know what is going to happen beyond the next couple days -- today will be very bad, tomorrow will be very bad. We expect to see the winds start to dissipate over the next couple days. It is impossible for us at this point to predict the holiday celebrations," she said.
Jackie Bray, commissioner of New York's Division of Homeland Security and Emergency Services, added that it's"totally appropriate to keep the pools open today, totally appropriate for people to be out, as long as they don't fall into these sensitive groups."
Columbus, Ohio, hits its worst air quality ever
Columbus, Ohio, hit an Air Quality Index of 244 on Thursday morning, the highest reading ever for the city.
The AQI has since lowered to 169. Any number over 100 is considered unhealthy for sensitive groups.
