Helena Joyce
Air pollution is a pressing issue, with dirty air estimated to contribute to shortening the lives of 40,000 people annually in the UK alone. While air quality is improving in Britain, it is important to be aware of pollution levels in your local area, especially near schools or your route to work. London, for example, has air pollution levels that could remain above the legal limit for the next decade without intervention. To determine the pollution level in your area, you can utilise resources such as Clean Air Hub, which provides news, case studies, and a postcode search feature for air quality forecasts. Alternatively, you can refer to the London Air Quality Network or the World Air Quality Index project, which offers real-time air pollution data for over 100 countries.
| Characteristics | Values |
|---|---|
| London's Overall Air Quality Index | 42 |
| PM2.5 (fine particulate matter) | 5.1 µg/m³ |
| PM10 (respirable particulate matter) | 5 |
| NO2 (nitrogen dioxide) | 16 |
| SO2 (sulfur dioxide) | 3 |
| O3 (ozone) | 9 |
| CO (carbon monoxide) | 5 |
| Main pollutant | PM2.5 |
| London's air quality forecast | 28 AQI⁺ US Good |
| Source of data | World Air Quality Index project |
| Date of data | Wednesday, June 25th, 2025 |
| Time of data | 03:10 am CST |
| Recommendation for people with heart or lung problems | Avoid areas with high air pollution |
| Suggestions to reduce exposure to air pollution | Keep away from busy roads, use side roads, and watch out for hotspots of dirty air |
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What You'll Learn
Real-time air pollution data
AirNow
AirNow is an interactive map service that provides real-time air quality data for the United States, Canada, and Mexico. The map includes data from air quality monitors in these countries, and users can select specific locations to view current, forecast, loop, and archive information. The AirNow map also features a Time Slider tool, allowing users to review NowCast AQI data for the previous 24 hours. During periods of high traffic or in the event of wildfires, the AirNow map may experience slower loading times.
World Air Quality Index (WAQI)
WAQI offers a real-time air quality map that covers over 80 countries and more than 10,000 stations worldwide. The map uses colour coding to indicate the level of air pollution, with green representing good air quality and purple or maroon indicating severely polluted air. WAQI's map takes into account various pollutants, including PM2.5 and PM10 particulate matter, which are considered harmful to human health. Users can also purchase the GAIA air quality monitor to measure real-time pollution levels in their specific location.
Airly
Airly is a smart air quality monitoring system that provides real-time data on outdoor air pollution. It utilises small sensors that measure parameters such as PM1, PM2.5, PM10, temperature, pressure, and humidity. Airly's sensors are strategically placed to best reflect the air quality in a given area, and the data is automatically updated hourly. The platform also incorporates visualised data from State Environmental Monitoring stations, providing a comprehensive overview of air pollution levels.
AQI.in
AQI.in is India's leading platform for air quality monitoring. It offers real-time air pollution data and solutions through its Prana Air smart city project. This project includes air quality monitors, drones, outdoor air purifiers, and data dashboards to help improve air quality and provide instant insights. AQI.in also provides blogs and updates on air pollution-related news and initiatives, such as Delhi's Air Pollution Mitigation Plan 2025.
NASA Earthdata
NASA Earthdata provides near-real-time data on air quality through its satellite-based observations. It offers products such as the Satellite-derived Aerosol Index (AI) to identify and track the long-range transport of volcanic ash, wildfire smoke, and dust from desert dust storms. Additionally, the VIIRS and MODIS Fire and Thermal Anomalies layer help detect active fires, volcanoes, and gas flares, which are significant sources of air pollution. NASA's data is valuable for studying the spatial and temporal distribution of these events and their impact on air quality and human health.
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Air quality monitoring stations
One example of an organisation that provides air quality monitoring data is AirNow.gov, which offers an interactive map displaying current air quality information for ozone or PM, whichever is highest. The map also provides a Fire and Smoke Map feature, which helps users understand the impact of wildfire smoke on their local air quality. Additionally, AirNow.gov offers email alerts, mobile apps, and other resources to help people stay informed about air quality issues.
Another resource for monitoring air quality is the AirData Air Quality Monitors app, which provides a mapping application for web and mobile devices. This app displays monitor locations and specific information, allowing users to query and download daily and annual summary data. The app includes map layers for various pollutants, such as CO, NO2, Ozone, PM2.5, and SO2, as well as specific monitoring networks like IMPROVE and NATTS.
There are also commercial options for air quality monitoring stations, with many manufacturers offering products in this space. These stations typically require a WiFi access point and a USB-compatible power supply for setup and can provide real-time air pollution data for specific locations. The cost of these stations can vary, but one can expect around $10,000 per station, excluding installation and maintenance fees.
By utilising these air quality monitoring stations and the data they provide, individuals can take proactive steps to protect their health and well-being, especially for those with respiratory conditions like asthma. Additionally, this information can guide decisions that promote a cleaner environment and better air quality for all.
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Pollution hotspots
In highly populated, urban areas, there is often a combination of stationary sources (e.g. industrial facilities) and mobile sources (e.g. cars and trucks) of pollution. Emissions from these sources can cause respiratory disease, childhood asthma, cancer, and other health problems. Diesel soot, for example, is a fine particulate matter that contributes to more than 3.2 million premature deaths worldwide each year. It is concentrated in densely populated areas, and one in six people in the US live near a diesel pollution hotspot.
Low-income communities and racial minorities are more vulnerable to the adverse health impacts of pollution. Blacks and Latinos generally face more pollution than whites and Asians, and low-income communities bear a higher risk burden than affluent ones. This unequal distribution of pollution has been termed an "environmental justice" issue by community groups and academic researchers.
To identify pollution hotspots, tools such as California's AB 2588 Air Toxics "Hot Spots" Program collect emission data, determine health risks, and notify local residents of major risks. By identifying these hotspots, regulators can develop strategies to reduce pollution and inform nearby populations.
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Health impacts of pollution
Air pollution is a major threat to global health and prosperity, causing more than 6.5 million deaths each year worldwide. This number has increased over the past two decades. The health effects of air pollution are wide-ranging and severe, and they vary depending on age, location, underlying health, and other factors.
Air pollution is a mix of hazardous substances from both human-made and natural sources. Major sources of air pollution include inefficient modes of transport (such as diesel vehicles), inefficient combustion of household fuels, coal-fired power plants, agriculture, and waste burning. Some air pollutants are also greenhouse gases with significant climate impacts.
Particulate matter (PM) is a significant component of air pollution, composed of chemicals such as sulfates, nitrates, carbon, or mineral dust. Vehicle and industrial emissions, cigarette smoke, and burning organic matter, such as wildfires, all contain PM. Fine particulate matter (PM2.5) is of particular concern as it can be inhaled deeply into the lungs and contribute to serious health problems. PM2.5 is approximately 30 times thinner than a human hair and is responsible for most health effects due to air pollution in the United States. In 2021, 97% of the urban population was exposed to concentrations of PM2.5 above the health-based guideline level set by the World Health Organization.
Ozone (O3) is another harmful pollutant. It is a powerful lung irritant that can cause inflammation and damage to the delicate lining of the small airways, impacting multiple body systems. High ozone levels can lead to breathing problems such as chest tightness, coughing, and shortness of breath, even in healthy young adults. Long-term exposure to ozone can cause lasting damage to respiratory health and increase the risk of metabolic disorders, central nervous system issues, and reproductive and developmental harm.
The health impacts of air pollution are not limited to respiratory issues. Both short-term and long-term exposure to air pollution have been linked to an increased risk of respiratory infections, heart disease, stroke, lung cancer, type 2 diabetes, obesity, systemic inflammation, Alzheimer's disease, and dementia. Air pollution is also associated with oxidative stress and inflammation in human cells, which may increase the risk of chronic diseases and cancer.
Certain populations are more vulnerable to the health impacts of air pollution. These include children, adolescents, pregnant women, older adults, and individuals with pre-existing health conditions, particularly heart and lung diseases. Socioeconomic factors also play a role, with low-income communities and minority populations often facing disproportionate exposure to air pollution and increased vulnerability due to limited access to healthcare and higher rates of pre-existing conditions.
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Ways to improve local air quality
Improving the air quality in your local area is an important task that requires collective action. Here are some ways in which you can contribute to improving the air quality in your community:
Reduce Vehicle Emissions
One of the major sources of air pollution is vehicle emissions. You can play a part in reducing this by opting for eco-friendly modes of transportation whenever possible. Consider walking or cycling for shorter distances, as these activities are not only good for the environment but also beneficial for your health. For longer distances, utilise public transportation such as buses, trams, subways, or trains, which are more affordable and help reduce congestion and air pollution. Carpooling is another excellent way to decrease traffic congestion and emissions per person, especially in urban areas.
If you must use a vehicle, opt for electric, hybrid, or smaller, more fuel-efficient vehicles that produce fewer emissions. Keep your car well-maintained, fixing any exhaust and oxygen sensor problems promptly and checking your tire pressure regularly, as under-inflated tires can lower gas mileage. Additionally, avoid driving during peak traffic hours, and keep your windows closed while in traffic to minimise exposure to exhaust fumes, which can increase pollution levels inside your car.
Conserve Energy and Choose Cleaner Energy Sources
Conserving energy at home is another way to reduce air pollution. Turn off lights and electronics when not in use, and consider investing in energy-efficient appliances and heating systems. You can also switch to cleaner energy sources by installing solar panels on your roof, which can power your home with renewable energy and even allow you to sell excess power back to the grid.
Manage Waste and Avoid Burning
Proper waste management is crucial for improving air quality. Compost food and garden waste, recycle non-organic trash, reuse grocery bags, and dispose of remaining waste through local collection services. Never burn trash or biomass (such as wood) for cooking or heating, as this directly contributes to air pollution and can cause eye and lung irritation, headaches, and other serious health issues.
Plant and Care for Trees
Trees are nature's air purifiers. They filter pollutants, absorb carbon dioxide, release oxygen, and help cool the surroundings. Planting and caring for trees in your community can significantly improve air quality and provide numerous environmental benefits.
Advocate for Change
Encourage local leaders and policymakers to adopt and support initiatives that improve air quality. This includes strengthening emissions standards, providing incentives for the purchase of cleaner vehicles and energy-efficient appliances, and promoting sustainable practices among local businesses and communities.
Remember, improving local air quality requires a collective effort, and each individual can make a significant difference. By following these steps and advocating for change, you can help create a healthier and more sustainable environment for yourself and your community.
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Frequently asked questions
There are several online tools that provide real-time air pollution data for over 100 countries. These tools use maps to display the Air Quality Index (AQI) of a particular area. The AQI is based on the measurement of particulate matter (PM2.5 and PM10), Ozone (O3), Nitrogen Dioxide (NO2), Sulfur Dioxide (SO2), and Carbon Monoxide (CO) emissions.
Air pollution is caused by both natural and man-made sources. Natural sources include windblown dust, dirt, sand, volcanic smoke, and burning materials. Man-made sources, which tend to be the leading contributors to air pollution in cities, include combustion from transportation and industrial businesses, biomass burning, and agricultural activities. The specific mix of contributors and pollutants can vary depending on the location and regulations.
Indoor air quality is not immune to outdoor air pollution. Additionally, there are indoor-specific sources that can increase pollution levels inside your home. To improve indoor air quality, it is important to manage both indoor ventilation and indoor pollution sources. When outdoor air pollution levels are high, it is recommended to keep windows and doors closed, set air conditioning systems to recirculate mode, use air purifiers or filters, and avoid strenuous activity that may increase inhalation of polluted air.
