Air Quality
Planning calculators for air quality — estimates from industry-style inputs.
Matches are ranked by relevance. Use CtrlK anytime to search the full site.
AQI Calculator
Air Quality Index from pollutant concentrations (PM2.5, PM10, O3, CO, SO2, NO2) using EPA breakpoint tables.
Indoor Air Quality Score Calculator
IAQ assessment from CO2, VOC, humidity, and particulates.
HVAC Filtration Efficiency Calculator
MERV rating selection from particle size targets.
Air Purifier Sizing Calculator
CADR needed from room size and air changes per hour.
Vehicle Emissions Calculator
Annual emissions from vehicle type, age, and mileage.
Stack Emission Rate Calculator
Mass emission rate from stack testing data.
Dispersion Modeling Calculator
Downwind concentration from AERMOD-style Gaussian dispersion.
Greenhouse Gas Inventory Calculator
Scope 1, 2, and 3 emissions for organizational GHG inventory.
Carbon Capture Calculator
CO2 captured from CCS technology and capacity.
Dust Control Calculator
Water application rate for construction site dust suppression.
Air Change Rate Calculator
Calculate air changes per hour (ACH) from airflow rate and room volume with recommendations by room type.
Carbon Footprint Offset Calculator
Estimate your annual CO₂ footprint from electricity, driving, flights, and diet, with tree and cost offsets.
Dust Particle Settling Calculator
Calculate particle settling velocity and time using Stokes' law with Cunningham slip correction.
Emission Rate Calculator
Calculate source emission rate from measured indoor concentration, ventilation rate, and room volume.
Filtration Efficiency Calculator
Calculate MERV/HEPA filter efficiency, CADR, penetration, and pressure drop for different particle sizes.
Indoor CO₂ Calculator
Model indoor CO₂ buildup from occupancy and ventilation. Find steady-state levels and time to reach 1,000 ppm.
Mold Risk Calculator
Assess mold growth risk from humidity, temperature, surface type, and ventilation quality with dew point analysis.
Radon Mitigation Calculator
Estimate post-mitigation radon levels, system costs, and health risk reduction for different mitigation approaches.
Ventilation Dilution Calculator
Calculate required dilution ventilation to control airborne contaminants below TLV/PEL limits.