Christopher Cappa's Lab

  •   Two-wavelength cavity ringdown photoacoustic spectrometer (CRD-PAS)
  •   Single Particle Soot Photometer (SP2)
  •   Cloud Condensation Nuclei (CCN) Counter
  •   CCN Counter with in situ droplet sizing
  •   Aerosol chemical speciation monitor (ACSM; joint with Qi Zhang)
  •   3-wavelength photoacoustic aerosol spectrometer (PASS-3)
  •   Scanning mobility particle sizer (SMPS)
  •   Scanning electrical mobility sizer (SEMS)
  •   Aerosol particle sizer (APS)
  •   Oxidation flowtube
  •   Ozone monitor
  •   NOx monitor
  •   SO2 monitor
  •   Miniature marine aerosol reference tank (miniMART)

Qi Zhang's Lab

  •   Aerodyne Soot-Particle High-Resolution Time-of-Flight Aerosol Mass Spectrometer (SP-AMS)
  •   Aerodyne Aerosol Chemical Speciation Monitor (ACSM, jointly with Chris Cappa)
  •   Scanning Mobility Particle Sizer (SMPS)
  •   Metrohm Particle Into Liquid Sampler (PILS)
  •   Metrohm Ion Chromatograph systems with conductivity and UV-vis detectors (2)
  •   Digital controlled thermodenuder (TD) system (room temperature – 300 oC)
  •   TSI 3772 Condensation Particle Counter (CPC)
  •   Aerosol generation system (Collison atomizer, pumps, and diffusion dryers)
  •   Droplet-on-demand droplet generator
  •   Electrospray aerosol generator
  •   Shimazu total carbon and total nitrogen (TC/TN) analyzer

MTL Weighing Chamber

The AQRC Sample Handling Lab serving IMPROVE network has been equipped with a benchtop MTL environmentally controlled weighing chamber that provides compliant environment (Quality Assurance Guidance Document 2.12) for ambient air quality research. Air velocities, temperature, dew point, and airborne particle counts are controlled and below their regulatory thresholds.

RDI sampler and XRF analysis

Rotating Drum Impactor (RDI) samplers collect size-segregated aerosols on 8 stages with 0.4 – 4.8 hour time resolution.  Analysis of RDI samples using X-Ray Fluorescence (XRF) technology provides quantitative elemental data of 28 elements.


Since 1994, the researchers at Air Quality Research Center are measuring the light absorption by particles collected on filters for IMPROVE network. This measurement has been conducted on developed in house instrument called HIPS (Hybrid Integrating Plate and Sphere system) operating at a single wavelength using red light of 633 nm from a He(Ne) laser. 

Gravimetric Mass Sampling

Our laboratory is equipped with two Mettler Toledo XP-6 microbalances and one Mettler Toledo XP2U ultrabalance. The maximum weight capacity of the XP-6 is 6 g, although most of our filters weigh around 50 mg. The quoted readability of XP-6 balance is 0.001 mg. The Gravimetric Mass Sampling is completed in the Sample Handling Lab by AQRC staff. Samples are measured during the pre-processing and post-processing where they are then sent for analysis.

TOA Carbon

The AQRC Quartz Carbon Lab is equipped with the top-notch OCEC instruments for Thermal/Optical Analysis (TOA). Our scientists and technicians can analyze particulate matters collected on quartz-fiber filters for organic carbon, elemental carbon, carbonate carbon, and total carbon using a variety of applications.

Anthony Wexler's Lab

  •   TSI 3080 Electrostatic Classifier (2)
  •   TSI 3081 Long Column DMA (2)
  •   TSI 3085 Nano DMA (2)
  •   TSI 3025 CPC (3)
  •   TSI 8520 DustTrak (2)
  •   TSI 3079 Atomizer Aerosol Generator
  •   Mini RAE 3000 PID
  •   API Model 100A Fluorescent SO2 analyzer
  •   Western Research Model 721-AT SO2 analyzer
  •   Counterflow Diffusion Denuders (5)
  •   TSI 3475 Condensation Monodisperse Aerosol Generator
  •   Thermo NOy analyzer (2)
  •   Thermo SO2 analyzer (3)

XRF Calibration Standards & Reference Materials


The AQRC measures the concentrations of chemical elements in samples using energy dispersive X-ray fluorescence (XRF). We specialize in measuring airborne particulate matter sampled on filters but can also analyze liquid, solid or powder samples.

Our laboratory is equipped with four PANalytical Epsilon 5 XRF analyzers. Each analyzer can be programmed to use up to 15 secondary excitation targets, allowing the analysis to be customized to provide optimal sensitivity for the elements of interest with comprehensive coverage of the periodic table.