BILLINGS, Mont. -- Wildfire smoke accounted for up to half of all health-damaging small particle air pollution in the western U.S. in recent years as warming temperatures fueled more destructive ...

With many Indian cities, including Delhi–NCR and nearby urban centres, battling severe air pollution, some people argue, "If we're already inhaling bad air, what's the harm in smoking a cigarette?" ...

Every year the winter cold brings an ambient haze of wood heater smoke to the suburbs, streets and houses of southern Australia. This smoke can aggravate asthma, divide neighbours and drive people ...