A yellow air quality warning is no longer in effect on Sunday for the Windsor-Essex area. The region was under the warning for most of the day, but is was removed Sunday afternoon. The air had improved from an orange warning, but Environment Canada said smoke was still causing or expected to cause poor air quality and reduced visibility. Localized poor air quality due to wildfires is expected to improve through Sunday morning. At 9 a.m., the air quality index was at 4-6 for in the region, which is a moderate risk level. The forecaster says air quality and visibility due to wildfires smoke can change rapidly over short distances and from hour to hour. Here is the forecast for Windsor-Essex from Environment Canada: