Final answer:
Organic substances that significantly evaporate at ordinary temperatures are Volatile Organic Compounds (VOCs), which are carbon-containing chemicals with high vapor pressures found in many household products and can affect both outdoor and indoor air quality. Therefore, correct option is 4.
Step-by-step explanation:
Organic substances that undergo significant evaporation at ordinary temperatures are known as Volatile Organic Compounds (VOCs). VOCs are carbon-containing chemicals that are emitted as gases from various sources.
These compounds have a relatively high vapor pressure, causing them to evaporate easily compared to nonvolatile substances. A few common examples of VOCs include benzene, toluene, formaldehyde, vinyl chloride, and acetone.
These compounds are found in everyday products like paints, varnishes, fuels, and cleaning products, and their presence is also notable in the characteristic 'new car smell'.
It is important to monitor VOC levels as they can be contaminants in groundwater and contribute to indoor air pollution, potentially leading to health issues.