PurpleAir Blog

  • How is PM2.5 Measured?

    PM2.5 is typically measured with an instrument called a PM2.5 monitor or an aerosol sampler. These monitors work by drawing in air and then measuring the concentration of PM2.5 particles on a filter. The results are typically expressed as micrograms per cubic meter of air (μg/m3).
  • United Kingdom Air Quality Fact Sheet

    The UK is one of the few places in the world that has been successfully decreasing overall levels of air pollution over recent years. In the past decade alone, the country has effectively cut its SO2 gas emissions by almost half. In 2019, the total emissions were nearly 300Gg less than in 20102.
  • India Air Quality Fact Sheet 2021

    India’s growth in recent decades has resulted in an exponential increase in the number of vehicles and industrial factories emitting pollutants into the atmosphere. As a result, the air quality has been worsening, with big cities seeing some of the highest levels of air pollution in the world. Particulate Matter (PM) concentrations have increased over the past decade and have since become a grave health concern for millions in the country.
  • Long-term Exposure to Air Pollution: Does it Affect Mortality?

    With global air quality reaching dangerous levels in many parts of the world, scientists and air quality specialists have begun closely studying the link between local air quality and public health. Recent findings suggest there may be a correlation between long-term exposure to air pollution and mortality rates. By looking at some case studies around the world, we can get a better idea of this relationship and whether we need to take caution around our exposure to airborne pollutants, such as Particulate Matter (PM2.5, PM10).
  • China Air Quality Fact Sheet 2021

    The past two decades of industrial expansion in China have resulted in an exponential increase in air pollution, decreasing the nation’s air quality. These recent spikes in pollutants, such as Particulate Matter (PM), have resulted in health concerns that have subsequently decreased the average life expectancy for residents.
  • Tracking Particulate Matter: Federal Reference Method (FRM) or Federal Equivalent Method (FEM)?

    With growing awareness of the potential impacts and effects of air pollution, federal agencies are strapping down and taking more diligent measures to track ambient particle concentrations. The US Environmental Protection Agency (EPA) is constantly redefining safe parameters of the national ambient air quality standards (NAAQS). One of the most concerning airborne pollutants tracked is fine particulate matter, particularly Particulate Matter 2.5 (PM2.5).
  • Indoor Plants Reduce Indoor Air Pollution, Right?

    A quick search on the internet will reveal many different opinions and studies pointing in opposite directions. While controversial, it is good to be informed and read from trusted sources. Here you will find a summary of some studies and their opinion.
  • Effects of Air Pollution During Infancy

    The study states that the increased stress on children’s bodies caused by air pollution can contribute to a host of health problems, such as a higher risk of lung function development, asthma, and other respiratory illnesses[2]. One of the main culprits contributing to these risks is the concentration of Particulate Matter (PM) in our ambient environment.
  • Community Spotlight: West Coast Calibration Factor Study

    Each time a PurpleAir sensor is installed, and air quality data is uploaded to the PurpleAir Map, the quality and reach of our community increases. In this post, we highlight the results from a scientific study and discuss what it means in the bigger picture. The network improves with each additional sensor, and studies like the one in this post are also part of the PurpleAir story.
  • Indoor vs Outdoor Air Quality – What’s the Difference?

    Since air is fluid, it can flow in and out of our homes, sometimes bringing pollutants with it. Thanks to the PurpleAir indoor and outdoor sensors, you can quickly compare air quality around you to make the best decision for your home or office. 
  • Fireworks Today – Can We Do Better?

    There's no doubt that large, night-sky-filled fireworks are dramatic and thrilling. From the immense splashes of colors streaking across the sky to the booms of massive explosions that send sparkles in all directions, fireworks have a unique place in people's hearts. For many, celebrations like 4th of July just feel right if they're capped with dramatic fireworks that get the heart racing. But is that enough? Is the cost too high? Let's see if we can do better.
  • PurpleAir Study Showcase: PurpleAir Sensors Used in Environmental Disparity Study Across US

    This study references real-time PurpleAir sensors to examine how air quality impacts different communities differently. Specifically, the study compares regions characterized according to different ethnicities and races.