What is the difference between the US Embassy AQI and the raw PM2.5 data (that is provided by the testing)

AQI or Air Quality Index is basically an index for reporting air quality daily. The index is developed by United States Environmental Protection Agency (US EPA). US EPA has developed a formula that converts the raw PM2.5 reading into AQI that can help inform health related decisions. AQI is calculated based on readings over a 24-hour period.
AQI focuses on the health effects which one may experience within a few hours or days of being exposed to after breathing the polluted air. The AQI is categorized into 6 categories and each is represented by a color. A table is provided below for a better understanding of the AQI concept.

Air Quality Index Levels of Health Concern



Good (green color)

0 to 50

Air quality is considered satisfactory, and air pollution poses little or no risk

Moderate (yellow color)

51 to 100

Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Unhealthy for Sensitive Groups (orange color)

101 to 150

Members of sensitive groups may experience health effects. The general public is not likely to be affected.

Unhealthy (red color)

151 to 200

Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.

Very Unhealthy (purple color)

201 to 300

Health warnings of emergency conditions. The entire population is more likely to be affected.

Hazardous (maroon color)

301 to 500

Health alert: everyone may experience more serious health effects


The reading reported on our samplers and our test reports is the raw PM2.5 reading in g/m3 (micrograms per cubic meter).

Can you do a reading of PM2.5 for me before and after installation to show me that this really works?

We sure can do a reading before and after the installation at nominal charges. Click here to schedule a home test.

Do test scores really get affected by the quality of air my kids breathe?

Researchers at United States Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) have found that moderately high indoor concentrations of carbon dioxide (CO2) can significantly impair people’s decision-making performance. These results have particular implications for schools and other office spaces with high occupant density.

The study was conducted on a small group and assessed on nine scales of decision making performance. The figure below demonstrates the test results


As can be seen from the above figure, even moderately elevated levels of indoor carbon dioxide can result in lower scores on six of nine scales of human decision-making performance. The results need to be replicated for a larger group but the test results do point to the possible low attentiveness in schools with high occupant density classrooms and low indoor air quality.