In case anyone needs proof that it’s feeling like summertime in D.C. early this year, this practically makes it official: Wednesday has been declared a Code Orange Air Quality Action Day, indicating unhealthy air quality. The Metropolitan Council of Governments expects ozone to be the chief cause. Ozone can limit a person’s ability to take a deep breath, or cause coughing, throat irritation, and breathing discomfort. Among actions Washington area residents are asked to take to reduce harmful air emissions are car pooling, telecommuting or taking mass transit to work. In other words, limit driving.