Huge firework displays will mark 4 July in the US, but the nation’s air quality will suffer

Getty ImagesFireworks form a major part of the 4 July celebrations, but the smoke they generate can cause air quality to plummet in the days that follow (Credit: Getty Images)Millions of tonnes of fireworks are set off each year to mark Independence Day in the US, causing air pollution to spike. Should you be worried?Fireworks…