The air around you is so polluted that you may wake up with an itchy throat, a dull headache, and a heavy chest. If you are outdoors, by afternoon, your eyes sting, and an unusual fatigue sets in.

On the other hand, those with common colds may notice mucus that starts clear but turns colored as the illness progresses, alongside a sore or itchy throat, clogged sinuses, a hoarse voice ...