The air was "very unhealthy" − purple on the air quality index map − in parts of Wisconsin, Iowa, Illinois, Indiana, Ohio, Pennsylvania and Michigan. Parts of Minnesota, Missouri, Kentucky, West Virginia, Virginia and New York were also in the red on a national map. Washington, D.C., made the top 10.Īccording to, huge swaths of the Midwest had air quality in at least the red, or "unhealthy" level, including most or all of the states of Iowa, Wisconsin, Illinois, Indiana, Ohio, Michigan and Pennsylvania. cities ranked among the top five major cities in the world with the worst air quality Wednesday morning: Detroit, Chicago and Minneapolis, according to IQ Air's live ranking of major world cities. Here's what you need to know about the air quality Wednesday: Which US city has the worst air quality? Just even parking right there and coming out, I can feel it in my lungs.” "I run a hundred miles a week, so this is going to be dangerous today. “You can smell it bad,” said Priti Marwah, who was beginning a run along Chicago's lakefront. Particulate levels set record highs Tuesday for the past two decades in Buffalo, New York Cincinnati Grand Rapids, Michigan Madison, Wisconsin and Milwaukee, the Weather Channel reported. The quality was expected to worsen and spread up and down the coast, infiltrating the New York City region and as far south as the Carolinas into Thursday. Populations on the East Coast also were under air quality alerts Wednesday, including the Washington, D.C., area.
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In Detroit, smoke combined with a dense fog to limit visibility to below a quarter-mile early Wednesday, forcing drivers to take extra caution. The sky was smoky in Milwaukee, Indianapolis and several other metropolises.
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from wildfires burning in Canada was continuing to make air quality unhealthy in much of the Midwest, and East Coast residents were bracing for another wave of haze.Ībout 102 million people live in areas were expected to reach at least a code orange level of air quality Wednesday, which is unhealthy for sensitive groups, the Environmental Protection Agency said.Ĭhicagoans awoke to a clouded, gray sky, limiting visibility, irritating lungs and filling noses with a thick burning smell for the second straight day Wednesday. Since hail can cause the rainfall estimates to be higher than what is actually occurring, steps are taken to prevent these high dBZ values from being converted to rainfall.Smoke drifting into the U.S. Hail is a good reflector of energy and will return very high dBZ values. These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. Depending on the type of weather occurring and the area of the U.S., forecasters use a set of rainrates which are associated to the dBZ values. The higher the dBZ, the stronger the rainrate. Typically, light rain is occurring when the dBZ value reaches 20. The scale of dBZ values is also related to the intensity of rainfall. The value of the dBZ depends upon the mode the radar is in at the time the image was created. Notice the color on each scale remains the same in both operational modes, only the values change. The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). Each reflectivity image you see includes one of two color scales. The dBZ values increase as the strength of the signal returned to the radar increases. So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). "Reflectivity" is the amount of transmitted power returned to the radar receiver. The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan.
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