playing outside

after a week, i returned to chengdu, to begin work. the state department measures the quantity of sulfur dioxide, nitrogen dioxide, carbon monoxide, ozone, and suspended particulate matter in the air at its china missions and publishes an air quality index daily.  for most of the time i was in chengdu, the air was rated “unhealthy,” with index values over 150 and particulate matter concentrations of 50 μg/m3. (as of the date that i’m writing this, the aqi in chengdu is 186; by comparison, the new york city region’s aqi is 38.) i was warned off exercising outside, but even just walking…