We know a lot about Missouri’s air, but our diverse state has air challenges and characteristics that vary from region to region, county to county and even season to season. A major air quality concern in July may be minimal or non-existent during the cooler months. Some areas face constant air quality challenges all year – and some of those challenges vary. Measuring and interpreting air quality data is valuable to identify certain pollutants, short-term air quality threats and making long-term decisions.