What does PSI stand for in pollution?

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What does PSI stand for in pollution?

1. Computation of the Pollutant Standards Index (PSI) The PSI is based on six pollutants particulate matter (PM10), fine particulate matter (PM2. 5), sulphur dioxide (SO2), carbon monoxide (CO), ozone (O3) and nitrogen dioxide (NO2).

What are the effects of the air pollutants that PSI measures on health and the environment?

The key air pollutant of concern during the haze period is particulate matter (PM). Short term exposure (i.e. continuous exposure to unhealthy daily average PSI levels over a period of a few days) to these air pollutants can cause respiratory symptoms and aggravate existing heart or lung disease.

What are the two examples of particulate air matter?

Particulates, or particulate matter (PM), refer to any mixture of solid particles or liquid droplets that remain suspended in the atmosphere for appreciable time periods. Examples of particulates are dust and salt particles, and water and sulphuric acid droplets.

What increases particulate matter?

Outdoor air levels of fine particles increase during periods of stagnant air (very little wind and air mixing), when the particles are not carried away by wind, or when winds bring polluted air into the state from sources outside the state.

What size of particulate matter is more dangerous to humans?

Some particles less than 10 micrometers in diameter can get deep into your lungs and some may even get into your bloodstream. Of these, particles less than 2.5 micrometers in diameter, also known as fine particles or PM2.5, pose the greatest risk to health.

What are the acceptable levels of particulate matter?

“WHO air quality guidelines” estimate that reducing annual average fine particulate matter (PM2.5) concentrations from levels of 35 μg/m3, common in many developing cities, to the WHO guideline level of 10 μg/m3, could reduce air pollution-related deaths by around 15%.

Which city has the cleanest air in the world?

Rankings: 25 Cities with the Cleanest Air in the World

  1. Zurich, Switzerland.
  2. Hobart, Australia.
  3. Reykjavik, Iceland.
  4. Turku, Finland.
  5. Tallinn, Estonia.
  6. Trondheim, Norway.
  7. Tampere, Finland.
  8. Uppsala, Sweden.

Why is Arizona water so bad?

Water hardness is caused by magnesium and calcium, which are naturally present in the Arizona landscape. Over time hard water will damage the pipes in your home through a process called scale build-up, which can lead to clogging and other serious plumbing issues.

What city has the worst water in America?

Cities With the Worst Public Water Ratings

  • Houston, Texas.
  • Omaha, Nebraska.
  • Fresno, California.
  • Reno, Nevada.
  • Modesto, California.
  • Pasadena, California.
  • Lubbock, Texas.
  • Midland, Texas. Midland’s drinking water contains 16 contaminants with levels above acceptable health limits, as well as 30 contaminants of potential concern.

Why is Florida water so bad?

Almost all of Florida’s water comes from an aquifer, an aquifer that has a high level of sulfur. Even when it’s filtered, some of the sulfur remains, and that makes for slightly smelly water; most of what you “taste” is actually “smell” (you really only taste sweet, sour, salty, bitter, umami, and perhaps fat).