The sun emits electromagnetic radiation in different wavelengths. It reaches the earth as light, UV radiation, and infrared radiation (heat). It has effects on the eyes, skin and thermal balance.
Daylight is solar radiation in the visible spectrum arriving from the sun and the sky hemisphere. Light falling on the eyes regulates the circadian rhythms of hormones melatonin and cortisol.
wind
Wind is the movement of air caused by differences in air pressure. It has thermal as well as mechanical effects on the body.
air quality
Air quality is highly related to the location of pollution sources and wind flow patterns. Common urban air pollutants such as particulate matter and ozone cause and aggravate diseases of the cardiovascular and respiratory systems.
sound
Sound is an audible vibration transmitted through air or another medium as waves. Sound can cause hearing impairment, but also has extra-auditory effects. These are mainly caused by annoyance and related stress.
humidity
Moisture added to the air increases the relative humidity, influencing the human thermal balance.
