Grimy city buildings and statues aren’t just unsightly, they also contribute to smog.

PARIS – Progress slashing unhealthy ozone in the western United States has largely been undone by pollution wafting across the Pacific from China, according to a study published Monday.

Harmful ozone pollution in Shanghai over the past 12 days has reached levels that are 1.5 times higher than the World Health Organisation’s recommended limit.

Air pollution in many national parks, from Yosemite to Joshua Tree and Kings Canyon, means a hike in the ‘fresh air’ is not as healthy as it seems, reports Mother Jones

Imagine asking your phone to calculate the optimal route for cycling to work while enjoying the best air quality, or calculating whether it's better to just take the train or bus to reduce pollutio

We’ve come to rely on Google Street View for everything from roads to hiking paths to coral reefs, but we may soon rely on it for something even more important – mapping urban air pollution.

Millions of vacationers escape to national parks each summer to take in the fresh air and scenic vistas.