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Washington, DC, has been labeled as the 'City of Trees' since the late 1800s. This has been the significant contribution made by former DC Gov Alexander R Shepherd who planted 60,000 trees in a decade.

Allergies afflict 40 million US citizens and cause colds, breathing problems and bronchial infections. Indoor allergies caused by dust mites can be lessened by using airtight pillow covers, replacing throw pillows, and using high-efficiency particulate air cleaners.

Washington, DC, is still one of America's healthier places to live due to its relatively low pollution index compared to other big cities. While there is an increase in the number of cars around this city, autoemissions testing guarantees Washingtonians 342 days of breathing healthy air in a year.