Indoor air pollution (exposure in the home) is much lower in Europe than in developing countries, such as India and China.

Particulate matter

High levels of particulate matter monitored in the indoor environment have been associated with increased rates of respiratory disease symptoms in children.

Nitrogen dioxide

High levels of nitrogen dioxide (NO2) or simply the presence of gas stoves are also associated with increased rates of respiratory disease symptoms in children.

Radon

Indoor radon exposure has been related to lung cancer in non-smokers. Inside homes with poor ventilation, radon can reach high levels.