The weight of an object is determined both by the gravitational force acting on the object and the mass of the object as well.
Option (d) EPA measures air quality daily is correct: -
• Option (a) incorrect because smog occurs in air with high air pollution. It usually occurs in colder weather condition and is a mixture of smoke and fog (water molecules in air).
• Option (b) is incorrect because majority of air pollution is due to carbon emission and particulate material evolved due to it and not bacteria. Some bacteria even fix air pollution through the process of bioremediation.
• Option (c) is incorrect as water treatment plants are primarily used to treat waste water so that it can be discharged in larger water bodies.
• Option (d) is correct because EPA (Environment Protection Agency) calculates Air Quality Index (AQI) for five major pollutants which are; ozone, particulate matter, carbon monoxide, sulphur dioxide and nitrogen oxide. This is done to safeguard public health and take preventive measures.
To learn more about EPA and its relation with air quality indexing, refer: -
brainly.com/question/20299710
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If there is an increase in coronavirus that means that the animals that eat the producers will be less which causes more producers
