However, as the largest metropolis on the Mediterranean Sea, Barcelona air pollution also stems from the transit of ships and port activity. In fact, emissions from the nearby port can cause up to 50% of total nitrous oxide levels in Barcelona.
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Cleanest air in the world in 2022. The cleanest air in the world is in Zurich. The pollution status is determined on the basis of average levels of PM2. 5 measured over a period of 12 months.
The major contributors to the air pollution in Dubai are vehicular emissions, industrial activities, construction sites, and dust storms. The high levels of pollution can have adverse effects on the health of the residents and tourists, causing respiratory problems, heart disease, and other health issues.