This index, reported by the Environmental Protection Department
Hong Kong Environmental Protection Department
Environmental Protection Department is a department of Hong Kong Government concerning the issues of environmental protection in Hong Kong.
What is air quality index?
What is PM2.5?
How long is ozone monitoring required?
About this website
Which gases are measured in Air Quality Index?
Nitrogen Dioxide (NO2) Sulphur Dioxide (SO2) Carbon Monoxide (CO) Ozone (O3)
What are the five pollutants monitored by the Air Quality Index?
What pollutants it covers: There's a U.S. AQI for five major pollutants that are regulated by the Clean Air Act: ozone, particle pollution (also called particulate matter), carbon monoxide, nitrogen dioxide and sulfur dioxide.
What are the measurement of air pollutants?
Air quality is measured with the Air Quality Index, or AQI. The AQI works like a thermometer that runs from 0 to 500 degrees. However, instead of showing changes in the temperature, the AQI is a way of showing changes in the amount of pollution in the air. Air quality is a measure of how clean or polluted the air is.
What are the 6 types of air pollution?
These six pollutants are carbon monoxide, lead, nitrogen oxides, ground-level ozone, particle pollution (often referred to as particulate matter), and sulfur oxides. Podcast – What is Modeled Air Data?
What does the Air Quality Index measure quizlet?
The Air quality index measures ground level ozone, particular pollutants, carbon monoxide, sulfur dioxide, and nitrogen dioxide. The EPA regulates these pollutants.
What are the 3 ways used to measure air pollutants?
Air pollutants are measured by a variety of techniques, most involving drawing sample air into the analyser and determining the concentration of the pollutant in the air.Ozone – ultraviolet spectroscopy. ... Oxides of nitrogen - chemiluminescence. ... Sulfur dioxide - pulsed fluorescent spectrophotometry.More items...•
What is the example of air pollution?
Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog.
What do air quality sensors measure?
Air quality sensors monitor gases, such as ozone, and particulate matter, which can harm human health and the environment. Federal, state, and local agencies jointly manage networks of stationary air quality monitors that make use of sensors.
What are the different types of pollution?
The three major types of pollution are air pollution, water pollution, and land pollution.
What is meant by Air Quality Index?
The Air Quality Index (AQI) is used for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air.
What's the best Air Quality Index?
AQI values below 100 are generally thought of as satisfactory. When AQI values are above 100, air quality is considered to be unhealthy-at first for certain sensitive groups of people, then for everyone as AQI values get higher.
Download Daily Data | US EPA
This query provides ozone and PM 2.5 data from AirNow for recent days that are not available from AQS. AQS data, as it becomes available, replaces any AirNow data. The AirNow data are not fully verified and validated through the quality assurance procedures monitoring organizations use to officially submit and certify data on the EPA AQS (Air Quality System) and, therefore, cannot be used to ...
Download Files | AirData | US EPA
Large data files available on the AirData website. Year PM2.5 FRM/FEM Mass (88101) PM2.5 non FRM/FEM Mass (88502) PM10 Mass (81102)
Air Quality Index Daily Values Report | US EPA
This report provides ozone and PM 2.5 data from AirNow for recent days that are not available from AQS. AQS data, as it becomes available, replaces any AirNow data. The AirNow data are not fully verified and validated through the quality assurance procedures monitoring organizations use to officially submit and certify data on the EPA AQS (Air Quality System) and, therefore, cannot be used to ...
What is air quality index?
Air Quality Index is an indicator of overall air quality, because it takes into account all of the criteria air pollutants measured within a geographic area. Although AQI includes all available pollutant measurements, you should be aware that many areas have monitoring stations for some, but not all, of the pollutants. Each row of the AQI Report lists summary values for one year for one county or CBSA. The summary values include both qualitative measures (days of the year having "good" air quality, for example) and descriptive statistics (median AQI value, for example).
What is PM2.5?
PM2.5 - Particulate Matter smaller than 2.5 micrometers (Note: PM2.5 data reported as parameter 88502 are not included in this summary report. Only federal reference method PM2.5 data reported as parameter 88101 are included in this report.)
How long is ozone monitoring required?
Required Days 8hr. Number of days in the year when ozone monitoring is required. This is normally the length of the "ozone season" -- months when ozone is a potential problem -- at the monitoring site. In many locations ozone monitoring is required April - October (214 days).
What is the purpose of the Pollutant Standards Index?
The Pollutant Standards Index, or PSI, is a type of air quality index, which is a number used to indicate the level of pollutants in air.
How is the PSI determined?
The highest sub-index value is then taken as the PSI value. In other words, the PSI is determined by the pollutant with the most significant concentration.
What is the scale of PSI?
The PSI is reported as a number on a scale of 0 to 500. The index figures enable the public to determine whether the air pollution levels in a particular location are good, unhealthy, hazardous or worse. The following PSI table is grouped by index values and descriptors, explaining the effects of the levels, according to Singapore's National Environment Agency (NEA).
Where is the PSI used?
The PSI has been used in a number of countries including the United States and Singapore. Since 1999, the United States EPA has replaced the Pollution Standards Index (PSI) with the Air Quality Index (AQI) to incorporate new PM2.5 and ozone standards. Prior to 1 April 2014, Singapore published the PSI and the 1-hour PM2.5 reading separately.
What is the purpose of air pollution research?
The research is advancing the ability to determine the composition of sources of air pollution, conduct exposure assessments, improve monitoring capabilities and support public health research , among other applications.
How does environmental change affect air pollution?
As environmental conditions change over time, air pollution transport and exposures will be affected. Researchers are developing, evaluating, and applying measurement and monitoring capabilities to improve characterization of source emissions, air quality, and human and environmental exposures for individual and mixtures of air pollutants.
What is the EPA?
EPA is a science leader in the development and technological advancement of instruments, methods, techniques and other tools to measure and monitor air quality and evaluate emissions from various sources that contribute to the nation’s remaining air quality challenges. The research is advancing the ability to determine the composition of sources ...
What is EPA monitoring?
EPA is advancing air measurement technologies and capabilities to assist states, communities and tribes with making air quality measurement and monitoring decisions. The research contributes by: 1 Advancing monitoring for compliance with the National Ambient Air Quality Standards (NAAQS) 2 Improving National Emissions Inventories 3 Identifying effective pollution prevention and control strategies 4 Developing next generation methods to inform regulatory and compliance strategies
Who developed the air quality index?
Central Pollution Control Board (CPCB) has developed this Air Quality Index in consultation with IIT-Kanpur and air quality-professionals and experts.
How is PM 2.5 Measured?
The most common measurement used to measure air quality is PM 2.5 and PM 10. It measures the particles in micrograms per cubic metre. PM 2.5 refers to the concentration of microscopic particles less than 2.5 microns in diameter and PM 10 refers to the concentration of particles less than 10 microns in diameter. Across the globe, all the countries use the same metrics for measuring the health of atmospheric air. India measures 2 additional pollutants namely lead and ammonia. AQI value of less than 50 is considered safe.
What is PM in science?
PM stands for Particulate Matter. It is a term used to define a mixture of solid particles and liquid droplets found in the air. Some particles such as dust, smoke, soot are visible to the naked eye, but other particulate matters are too small that they are only visible in the electron microscope.
Why is clean air important?
Clean air is extremely important to maintain good health and the environment. Our atmosphere is predominantly made up of 2 important gases that are vital for life on earth, these are Oxygen and Nitrogen. AQI keeps a tab on 8 major air pollutants in the atmosphere namely,
What are the sources of PM?
Some of the sources of PM are construction sites, fire, fields, unpaved roads etc. Most of the particles are formed due to complex reactions of chemicals such as sulfur dioxide and nitrogen oxides. These are the pollutants emitted by automobiles, industries, power plants etc.
Where does information about air quality come from?
Instruments on the ground and satellites orbiting Earth collect information about what is in our air. For example, satellites in NOAA’s GOES-R (short for Geostationary Operational Environmental Satellites-R) Series monitor the particle pollution in our atmosphere.
How is air quality measured?
The Short Answer: Air quality is measured with the Air Quality Index , or AQI. The AQI works like a thermometer that runs from 0 to 500 degrees. However, instead of showing changes in the temperature, the AQI is a way of showing changes in the amount of pollution in the air.
What are some things that cause bad air quality?
Ozone is a gas you’ve probably heard of as a layer high up in Earth’s atmosphere. This ozone layer is a good thing—it helps block us from the Sun’s harmful radiation. However, ground level ozone is bad for human health. It is created when sunlight reacts with certain chemical emissions (for example nitrogen dioxide, carbon monoxide and methane). These chemicals can come from industrial facilities, car exhaust, gasoline vapors and other sources.
How is ground level ozone measured?
Ground level ozone can also be measured by the JPSS series of satellites. GOES-R Series satellites can provide particle pollution measurements approximately every five minutes during the day. JPSS satellites can provide a higher resolution measurement of aerosols over the entire planet once a day.
How does the AQI work?
The AQI works sort of like a thermometer that runs from 0 to 500 degrees. However, instead of showing changes in the temperature, the AQI is a way of showing changes in the amount of pollution in the air.
What are the two pollutants that pose the greatest risk to human health in the United States?
Ground level ozone and airborne particles are the two air pollutants that pose the greatest risk to human health in the United States. They are also the two of the main ingredients in smog, a type of air pollution that reduces visibility.
What does it mean when your AQI is under 50?
An AQI under 50 means that the air quality is good. At this low AQI level, a person can spend time outdoors and air pollution will pose very little risk to their health. As the AQI number increases, so does the risk to human health. (See the chart below for a summary of the AQI levels of health concern.) Air quality is measured in Air Quality Index ...
What is air quality index?
Air Quality Index is an indicator of overall air quality, because it takes into account all of the criteria air pollutants measured within a geographic area. Although AQI includes all available pollutant measurements, you should be aware that many areas have monitoring stations for some, but not all, of the pollutants. Each row of the AQI Report lists summary values for one year for one county or CBSA. The summary values include both qualitative measures (days of the year having "good" air quality, for example) and descriptive statistics (median AQI value, for example).
What is PM2.5?
PM2.5 - Particulate Matter smaller than 2.5 micrometers (Note: PM2.5 data reported as parameter 88502 are not included in this summary report. Only federal reference method PM2.5 data reported as parameter 88101 are included in this report.)
How long is ozone monitoring required?
Required Days 8hr. Number of days in the year when ozone monitoring is required. This is normally the length of the "ozone season" -- months when ozone is a potential problem -- at the monitoring site. In many locations ozone monitoring is required April - October (214 days).
