Greta Jimenez
Air pollution is a major public health problem, causing more than 6.5 million deaths each year globally. It is a mix of hazardous substances from both human-made and natural sources. Human-made sources include vehicle emissions, fuel oils, natural gas, manufacturing by-products, power generation, and chemical production. Natural sources include smoke from wildfires, ash and gases from volcanic eruptions, and gases like methane emitted from decomposing organic matter in soils. To assess the pollution hazard, public health agencies perform risk assessments to determine the increased risk of illness from exposure to toxic air pollutants. These risk assessments involve hazard identification, exposure assessment, dose-response assessment, and risk characterization. Health Risk Assessments (HRAs) are tools used to estimate the adverse health effects of exposure to environmental pollutants. Air Quality Index (AQI) is another tool used to communicate outdoor air quality and health, with higher AQI values indicating greater levels of air pollution and health concerns.
| Characteristics | Values |
|---|---|
| Environmental risk assessment (ERA) | A process to estimate the probability of adverse outcomes from environmental changes caused by human activities |
| ERA goal | To promote sustainability and protect the planet from degradation |
| ERA and compliance | Helps organisations comply with the law and protect human and environmental health |
| Air Pollution Health Risk Assessment (AP-HRA) | A tool to forecast the expected health effects of policies impacting air quality |
| AP-HRA and health | Plays a critical role in health promotion and disease prevention at individual, community, and global levels |
| AP-HRA and policy | A key tool for guiding public policy decisions |
| AP-HRA and exposure | Assesses exposure to specific air pollutants for the target population |
| Physical hazards | Noise pollution, radiation, electromagnetic fields |
| Biological hazards | Invasive species, genetically-modified organisms, disease-causing microbes |
| Habitat destruction | Deforestation, mining, and urbanisation |
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Air pollution
One example of an HRA is the Air Pollution Health Risk Assessment (AP-HRA). AP-HRAs can play a critical role at the individual, community, and global health promotion and disease prevention levels. They forecast the expected health effects of policies impacting air quality under various policy, environmental, and socioeconomic circumstances. AP-HRAs include mathematical estimations and modelling of several processes, including population estimates, population exposure to pollutants, and adverse health impact assessments through specific concentration-response functions. Precise data is required for AP-HRAs, such as population data, air quality data, baseline mortality or disease rates, and risk estimation.
Another tool used to assess air pollution is the Air Quality Index (AQI). The AQI is used to communicate about outdoor air quality and health. It includes six color-coded categories, each corresponding to a range of index values. The higher the AQI value, the greater the level of air pollution and the greater the health concern. For example, an AQI value of 50 or below represents good air quality, while an AQI value over 300 represents hazardous air quality. The AQI is a useful tool for understanding the level of health risk associated with air pollution and can help guide public policy decisions.
In addition to HRAs and the AQI, there are other methods for assessing exposure to air pollution. One method is air monitoring, which can involve direct measurements using personal monitors or indirect measurements using fixed-site monitors combined with data on time-activity patterns. Another method is biological measurements, which use biological markers to assess exposure. Questionnaires can also be used to categorize individuals into groups based on their exposure levels. Microenvironments, such as outdoors in a specific community, inside a motor vehicle, or inside a residence, can also be defined and analyzed for pollutant levels. By combining these various assessment methods, we can better understand the impact of air pollution and work towards improving air quality and public health.
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Water pollution
There are four main sources of water pollution: sewage discharges, industrial activities, agricultural activities, and urban runoff, including stormwater. Sewage discharges refer to the release of wastewater from sources such as toilets, sinks, and showers, as well as commercial, industrial, and agricultural activities. Industrial activities can add various pollutants to water bodies if the wastewater is not treated and managed properly, including heavy metals, organic matter, toxins, pharmaceuticals, and microplastics. Agricultural activities contribute to water pollution through the use of fertilizers, pesticides, and animal waste, which can wash into waterways during rainfall. Finally, urban runoff, including stormwater, can carry road salts, oil, grease, chemicals, and debris into water bodies.
To assess water pollution hazards, it is important to conduct water quality monitoring and assessments. This includes evaluating various physical, chemical, and biological parameters, such as turbidity, pH, total dissolved solids (TDS), nitrates, heavy metals, and microbial content. Sampling and testing water from different locations can help identify areas where contamination is present. Remote sensing technologies, such as geospatial analysis, have also been used successfully to assess water pollution levels, particularly during the COVID-19 lockdown when human activities were reduced.
Addressing water pollution is crucial for protecting human health and the environment. This includes improving water supply and sanitation infrastructure, managing water resources effectively, and implementing proper wastewater treatment technologies. By taking these actions, we can work towards ensuring safe and accessible water for all, which is recognized as a fundamental human right.
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Noise pollution
To assess noise pollution, it is important to identify the sources of noise and their potential impact. Geospatial data and tools like the Geoapify Places API can help identify noise sources within a specified radius of a location, providing valuable insights for noise pollution assessment. Multiple visits to a location at different times of the day and on different days of the week can help build a comprehensive picture of the noise levels in the area.
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Radiation
The degree of hazard posed by radiation depends on the concentration of the contaminants, the energy of the radiation being emitted, the type of radiation, and the proximity of the contamination to organs of the body. The risk of developing adverse health effects depends on the radiation dose. The higher the dose, the higher the risk of adverse effects. Low levels of radiation encountered in the environment do not cause immediate health effects but are a minor contributor to our overall cancer risk. Very high levels of radiation exposure delivered over a short period can cause symptoms such as nausea and vomiting within hours and can sometimes result in death over the following days or weeks. This is known as acute radiation syndrome, or "radiation sickness".
To assess the hazard posed by radiation, radiation monitoring is required. This involves measuring the radiation dose or radionuclide contamination to assess or control exposure to radiation or radioactive substances, and interpreting the results. In the United Kingdom, the HSE has issued guidance on selecting the correct portable radiation measurement instrument for the application concerned. This covers all radiation instrument technologies and is a useful comparative guide for selecting the correct technology for the contamination type.
In the case of a radiation emergency, people should follow information from local authorities and comply with urgent protective actions to reduce their risk of exposure.
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Biological hazards
In a workplace setting, employees who work with live animals or animal products, such as blood, tissue, milk, and eggs, are at risk of exposure to animal diseases and infections, which may be transmissible to humans. For instance, avian flu or the Hendra virus can be contracted from animals, and workers in healthcare settings may be exposed to biological hazards through contact with human bodily fluids, such as blood, saliva, mucus, urine, and feces. These fluids carry a high risk of transmitting viral or bacterial diseases.
To assess the risk of biological hazards, it is essential to identify the specific hazard and its potential health impacts. This involves determining the likelihood and conditions under which the hazard could cause harm. For example, in the case of a disease outbreak, understanding the transmission rate, incubation period, and case fatality rate is crucial. Risk assessors rely on laboratory data, epidemiological data, and knowledge of the sensitivity of detection methods to make these determinations.
Additionally, it is important to consider the population groups that are likely to be at the highest risk of health effects from the biological hazard. Certain groups may be more vulnerable due to factors such as age, pre-existing health conditions, or socioeconomic status. By understanding the specific hazard, its transmission routes, and the vulnerable populations, public health officials can implement targeted interventions to reduce the impact of the biological hazard on the community.
Furthermore, when assessing biological hazards, it is essential to consider the potential for interaction and exacerbation with other types of hazards, such as chemical or physical hazards. For example, air pollution (a chemical hazard) can weaken respiratory tissues, making individuals more susceptible to respiratory infections (biological hazards). By addressing both the biological hazard and its contributing factors, a more comprehensive risk mitigation strategy can be developed.
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Frequently asked questions
A pollution hazard is an environmental health hazard caused by a mix of hazardous substances from both human-made and natural sources.
Vehicle emissions, fuel oils, natural gas, manufacturing by-products, power generation, and chemical production are the primary sources of human-made pollution.
Exposure to toxic air pollutants increases health risks and can cause a wide variety of adverse health impacts, ranging from subclinical effects to premature death.
A health risk assessment (HRA) is a tool used to estimate the adverse health effects of exposure to environmental pollutants. It involves hazard identification, exposure assessment, dose-response assessment, and risk characterization.
