Zip Code 50401
📍 Mason City, IA
Toxic Air Emissions Report (2024)
Data Source: EPA TRI (2024) • Updated Nov 2025
279,414.08 lbs
State Score
9
/ 100
National Score
5
/ 100
In 2024, industrial facilities in Mason City, IA released over 279,414.08 lbs of pollutants. The primary source was AG PROCESSING INC, which emitted large quantities of n-Hexane into the local air. Residents of 50401 face significantly higher exposure risks than the national average.
Top Polluting Facilities
- AG PROCESSING INCn-Hexane released to air121,949.00 lbsLBS
- CURRIES DIV OF AADG INC.Owned by: ASSA ABLOY INCCertain glycol ethers released to air47,102.00 lbsLBS
- KRAFT HEINZ FOODS COOwned by: THE KRAFT HEINZ COChlorodifluoromethane (HCFC-22) released to air25,000.00 lbsLBS
- CURRIES DIV OF AADG INC.Owned by: ASSA ABLOY INCn-Butyl alcohol released to air19,225.00 lbsLBS
- WOODHARBOR DOORS & CABINETRYOwned by: nanXylene (mixed isomers) released to air14,189.00 lbsLBS
- CURRIES DIV OF AADG INC. Cancer RiskOwned by: ASSA ABLOY INCStyrene released to air12,358.00 lbsLBS
- GOLDEN GRAIN ENERGY LLC Cancer RiskOwned by: nanAcetaldehyde released to air11,758.24 lbsLBS
- HEIDELBERG MATERIALS US CEMENT LLCOwned by: HEIDELBERG MATERIALS US INCAluminum (fume or dust) released to air8,040.00 lbsLBS
- GOLDEN GRAIN ENERGY LLCOwned by: nann-Hexane released to air6,931.68 lbsLBS
- HEIDELBERG MATERIALS US CEMENT LLCOwned by: HEIDELBERG MATERIALS US INCAmmonia released to air6,146.00 lbsLBS
- GOLDEN GRAIN ENERGY LLCOwned by: nanMethanol released to air3,506.93 lbsLBS
- REG MASON CITY LLCOwned by: CHEVRON CORPMethanol released to air3,079.00 lbsLBS
- HEIDELBERG MATERIALS US CEMENT LLCOwned by: HEIDELBERG MATERIALS US INCManganese compounds released to air56 lbsLBS
- HEIDELBERG MATERIALS US CEMENT LLC Cancer RiskOwned by: HEIDELBERG MATERIALS US INCNickel compounds released to air23 lbsLBS
- HEIDELBERG MATERIALS US CEMENT LLCOwned by: HEIDELBERG MATERIALS US INCLead compounds released to air18.5 lbsLBS
- HEIDELBERG MATERIALS US CEMENT LLCOwned by: HEIDELBERG MATERIALS US INCChromium compounds (except for chromite ore mined in the Transvaal Region) released to air13 lbsLBS
- HEIDELBERG MATERIALS US CEMENT LLC Cancer RiskOwned by: HEIDELBERG MATERIALS US INCArsenic compounds released to air6 lbsLBS
- HEIDELBERG MATERIALS US CEMENT LLC Cancer RiskOwned by: HEIDELBERG MATERIALS US INCCadmium compounds released to air6 lbsLBS
- PURINA ANIMAL NUTRITION LLC - MASON CITYOwned by: LAND O LAKES INCZinc compounds released to air3.67 lbsLBS
- HEIDELBERG MATERIALS US CEMENT LLCOwned by: HEIDELBERG MATERIALS US INCMercury compounds released to air2.9 lbsLBS
- HEIDELBERG MATERIALS US CEMENT LLC Cancer RiskOwned by: HEIDELBERG MATERIALS US INCDioxin and dioxin-like compounds released to air0.1295 lbsLBS
- STELLAR INDUSTRIES INC. - MASON CITY PLANT Cancer RiskOwned by: STELLAR INDUSTRIES INCLead released to air0.029 lbsLBS
Nearby Pollution Sources (< 20 miles)
- Hanlontown, IA (50444) 12.9 mi awayHeavy Industrial Activity9,922.00 lbsAnnual Emissions
- Sheffield, IA (50475) 18.8 mi awayHeavy Industrial Activity1.1796 lbsAnnual Emissions
Check Nearby Zip Codes
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Protect Your Lungs
Because toxic gases and VOCs were detected in this area (likely from the Styrene), standard filters are not enough. We strongly recommend an Activated Carbon purifier to adsorb these fumes.
View Recommended Carbon Filters →Chemical Breakdown
Top 5 Pollutants by Weight
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