Michigan earned mixed results in a recent American Lung Association air quality study.
The agency’s 'State of the Air 2016' says the Grand Rapids and Detroit metropolitan areas both reduced ozone pollution, or smog, levels in various indicators, but issues still exist.
The report says the Grand Rapids Metropolitan Area reduced its average number of unhealthy ozone level days, but retained its ranking of 18th most polluted.
The ALA report also provides grades for counties with monitors assigned to record data. Seven of Michigan’s 25 recorded counties dropped one grade, including Kalamazoo. Wayne County saw improvement.
The annual report analyzes air pollution data from federal, state, local and tribal agencies.
It looks at short and long-term particle pollution numbers, among other items.
