Washington was briefly the most polluted major city in the world, according to IQAir data, after a massive Independence Day fireworks show touted by the Trump administration as "awesome".

Washington was the world’s most polluted major city between around 3am to 5am on July 5. Read more at straitstimes.com. Read more at straitstimes.com.

Washington was the world’s most polluted major city between around 3am to 5am on July 5. Read more at straitstimes.com. Read more at straitstimes.com.

July 4 fell during a record-breaking heat wave that upended the parades, block parties and barbecues that traditionally mark the day the United States celebrates its break from Britain.