Visit us on Twitter But in the troposphere, near ground-level, ozone molecules are both air pollutants, threatening the health of living things, and greenhouse gases, trapping heat and contributing to climate change. Ozone and other air pollutants are common in urban areas in late afternoon.Credit: UCAR. When it’s inhaled, ozone can damage lung tissues. Since 1900, the amount of ozone near the Earth's surface has more than doubled due to more automobiles and industry. Visit us on Instagram, EPA’s Actions You Can Take to Reduce Air Pollution, Air Pollution: How We're Changing the Air. But neither of these sources contributes enough ozone to be considered a threat to the health of humans or the environment. And, on a larger scale, you can look for energy sources that don’t emit the pollution that leads to ozone. struct source–receptor relationships for tropospheric ozone. Choosing public transportation, walking, or biking instead of traveling in cars is a good step. Unlike most other air pollutants, ozone is not directly emitted into the air. © 2014 UCAR with portions adapted from Windows to the Universe (© 2005 NESTA), > Air Pollution: How We're Changing the Air, National Center for Atmospheric Research Plants and soil release some. Tropospheric ozone is formed by the interaction of sunlight, particularly ultraviolet light, with hydrocarbons and nitrogen oxides, which are emitted by automobile tailpipes and smokestacks. At the end of the day, as the Sun starts to set, the production of ozone begins to subside. Some elastic materials can become brittle and crack, while paints and fabric dyes may fade more quickly. Unlike most other air pollutants, ozone is not directly emitted into the air. Rubber, textile dyes, fibers, and certain paints may be weakened or damaged by exposure to ozone. If you wait until evening to refuel your car or mow your lawn, the pollutants released will be unlikely to become ozone. In urban areas, high ozone levels usually occur during warm summer months. Some migrates down from the stratosphere. To form, ozone needs sunshine to fuel the chemical reaction. Motor vehicle exhaust, industrial emissions, and chemical solvents are the major anthropogenic sources of these ozone precursors. 1 Introduction Tropospheric ozone is an important air pollutant, as well as a contributor to anthropogenic radiative forcing of the climate (Monks et al.,2015). Typically, ozone levels reach their peak in mid to late afternoon, after exhaust fumes from morning rush hour have had time to react in sunlight. University Corporation for Atmospheric Research, Visit us on Facebook Ozone is harmful to all types of cells. In urban areas, high ozone levels usually occur during warm summer months. When ozone pollution reaches high levels, pollution alerts are issued urging people with respiratory problems to take extra precautions or to remain indoors. A hot, sunny, still day is the perfect environment for the production of ozone pollution. Tropospheric ozone is a short-lived climate pollutant with an atmospheric lifetime of hours to weeks. The majority of tropospheric ozone formation occurs when nitrogen oxides (NOx), carbon monoxide (CO) and volatile organic compounds(VOCs), react in the atmosphere in the presence of sunlight, specifically the UV spectrum. It can impair an athlete's performance, create more frequent attacks for individuals with asthma, cause eye irritation, chest pain, coughing, nausea, headaches and chest congestion. It does not have any direct emissions sources, rather it is a secondary gas formed by the interaction of sunlight with hydrocarbons – including methane – and nitrogen oxides, which are emitted by vehicles, fossil fuel power plants, and other man-made sources. Major sources of ozone in the tropo-sphere are transport from the stratosphere, and photochemi- Check out the EPA’s Actions You Can Take to Reduce Air Pollution  for more tips to reduce air pollution. Typically, ozone levels reach their peak in mid to late afternoon, after exhaust fumes from morning rush hour have had time to react in sunlight. It can worsen heart disease, bronchitis, and emphysema. Most of the ozone that is found near the ground comes from vehicle exhaust and emissions from factories, power plants, and refineries. 105 (Chameides and Walker, 1973) suggested that tropospheric ozone originated mainly from production 106 within the troposphere by photochemical oxidation of CO and hydrocarbons catalysed by HO x In the stratosphere, ozone molecules play an important role - absorbing ultraviolet radiation from the Sun and shielding Earth from dangerous rays. Although the ozone precursors often originate in urban areas, winds can carry NOx hundreds of kilomet… A hot, sunny, still day is the p… A small amount of ozone does occur naturally at ground level. NOx, CO, and VOCs are considered ozone precursors. Check with your utility company to find out where your energy comes from. Tropospheric ozone is formed by the interaction of sunlight, particularly ultraviolet light, with hydrocarbons and nitrogen oxides, which are emitted by automobile tailpipes and smokestacks. What can we do to decrease the production of ozone in the troposphere?