Inconsistencies in air quality metrics: ‘Blue Sky’ days andPM10 concentrations in Beijing

Abstract

International attention is focused on Beijing’s efforts to improve air quality. The number ofdays reported as attaining the daily Chinese National Ambient Air Quality Standard for cities,called ‘Blue Sky’ days, has increased yearly from 100 in 1998 to 246 in 2007. However, analysisof publicly reported daily air pollution index (API) values for fine particulate matter(diameter≤10 µm,PM10), indicates a discrepancy between the reported ‘Blue Sky’ days (defined asAPI≤100,PM10≤150 µg m−3) and published monitoring station data. Here I show that reported improvements in airquality for 2006–2007 over 2002 levels can be attributed to (a) a shift in reported dailyPM10 concentrations from just above to just below the national standard, and (b) a shift of monitoringstations in 2006 to less polluted areas. I found that calculating daily Beijing API for 2006and 2007 using data from the original monitoring stations eliminates a bias in reportedPM10 concentrations near the ‘Blue Sky’ boundary, and results in a number of ‘Blue Sky’ days and annualPM10 concentration near 2002 levels in 2006 and 2007 (203 days and∼167 µg m−3 calculated for 2006—38days fewer and a PM10 concentration ∼6 µg m−3 higher than reported; 191 ‘Blue Sky’ days and∼161 µg m−3 calculated for 2007—55 days fewer and aPM10 concentration∼12 µg m−3 higher than reported;203 days and 166 µg m−3 were reported in 2002). Furthermore, although different pollutants weremonitored before daily reporting began and less stringent standards wereimplemented in June 2000, reported annual average concentrations of particulate(diameter≤100 µm, TSP) andnitrogen dioxide (NO2) indicate no improvement between 1998 and 2002. This analysis highlights the sensitivityof monitoring data in the evaluation of air quality trends, and the potential for themisinterpretation or manipulation of these trends on the basis of inconsistent metrics.