*BC (black carbon) has been used in the AQHI calculation when available; BC data not available at all sites and times. 
Health Risk AQHI At Risk Population General Population
Low Risk 1 – 3 Enjoy your usual outdoor activities. Ideal air quality for outdoor activities.
Moderate Risk 4 – 6 Consider reducing or rescheduling strenuous activities outdoors if you are experiencing symptoms. No need to modify your usual outdoor activities unless you experience symptoms.
High Risk 7 – 10 Reduce or reschedule strenuous activities outdoors. Children and the elderly should also take it easy. Consider reducing or rescheduling strenuous activities outdoors if you experience symptoms.
Very High Risk 10+ Avoid strenuous activities outdoors. Children and the elderly should also avoid outdoor physical exertion. Reduce or reschedule strenuous activities outdoors, especially if you experience symptoms.

Health Vulnerability Statement

All communities included in this report are designated as “underserved” by MDEnviroScreen. Notably, Turner Station, Cheverly, Cedar Heights, Curtis Bay, and areas near HCNR, and HU-B are further classified as “overburdened,” meaning they face a cumulative impact of three or more environmental or health stressors.

Critical sensitive population indicators (75th Percentile or higher):

Environment and Climate Change Canada’s Air Quality Health Index (AQHI) is a reliable guide to daily health risks, made stronger by the addition of black carbon data. While the AQHI+ successfully captures common and immediate threats to human health, no single index is exhaustive for all toxic substances or localized pollutants. Due to compounding health disparities and socio-environmental stressors, the reported AQHI+ represents a conservative baseline; the actual risk to residents in the tracts mentioned above is likely higher than this index alone suggests.

MDEnviroScreen Map

Spatial distribution of overburdened communities via MDEnviroScreen.

AQHI Summary for All ARP Grant-funded Modulair Sensors (BC Adjusted)
Sensor Total_Hours Mean_AQHI Median_AQHI Max_AQHI Hours_High_Risk Min_AQHI
MOD_00536 - Cheverly 692 4 4 12 29 2
MOD_00537 - Turner Station North 732 5 4 16 104 2
MOD_00745 - Cedar Heights 732 4 4 11 66 1
MOD_00746 - HCNR 732 3 3 8 19 1
MOD_00747 - Turner Station South 732 4 4 11 48 1
MOD_00748 - Annapolis 732 3 3 10 30 1
MOD_00749 - HU - Beltsville 730 3 3 10 16 0
AQHI Summary at MDE Regulatory Monitors*
Monitor Total_Hours Mean_AQHI Median_AQHI Max_AQHI Hours_High_Risk Min_AQHI
HUB 677 3 3 11 23 1
Essex 0 NaN NA -Inf 0 Inf
Lake_Montebello 717 3 3 12 30 1
Piney_Run 703 3 2 19 36 0
HCNR 708 3 3 12 30 1
*HCNR statistics are a hybrid of regulatory monitor data (PM2.5 & NO2) and sensor data (O3). 

The highest AQHI value recorded was 16, reached by sensor(s) MOD_00537 - Turner Station North ( 4 h)

Highest AQHI Sensor(s) and Hours at Maximum
Sensor Max_AQHI Hours_at_Max
MOD_00537 - Turner Station North 16 4

Summary Statistics for MetOne Sensors (880nm)
Monitor Total Hours Mean 880 Median 880 Max 880 Min 880 Skew Kurtosis Hours ≥ 600 % Time ≥ 600 Hours ≥ 300 % Time ≥ 300
B19939 424 327.30 257.48 1482.943 81.26333 2.291031 7.529850 32 7.5 177 41.7
D11556 731 883.18 634.50 5222.071 91.43944 2.332514 6.926464 385 52.7 629 86.0
D11559 732 566.39 406.09 4587.337 28.07667 3.639552 17.014286 199 27.2 492 67.2
D14645 732 961.50 655.06 6923.434 100.30833 2.768628 10.841541 400 54.6 642 87.7
D14648 732 1054.50 660.63 8027.632 102.06278 2.809080 10.584082 415 56.7 648 88.5

Concentration Statistics Matrix
Station Pollutant Mean Median MAD Max (Outlier Check) Skew Kurtosis Valid Obs
Annapolis co 815.07 753.51 80.53 2184.78 3.22 13.77 733
Annapolis no 2.06 1.84 0.42 5.83 1.97 5.70 733
Annapolis no2 14.41 11.11 8.30 39.8 0.73 -0.69 733
Annapolis o3 24.35 21.25 16.69 66.53 0.54 -0.68 733
Annapolis pm1 11.37 8.32 4.77 96.24 3.82 16.79 733
Annapolis pm10 18.08 14.53 6.47 102.24 3.32 13.52 733
Annapolis pm25 12.09 8.89 5.02 97.6 3.80 16.68 733
Cedar Heights co 847.09 789.81 102.87 2228.42 2.84 11.99 733
Cedar Heights no 2.25 1.89 0.45 16.68 6.04 48.31 733
Cedar Heights no2 17.83 14.72 11.93 44.33 0.53 -0.98 733
Cedar Heights o3 24.48 20.49 17.23 72.06 0.59 -0.57 733
Cedar Heights pm1 14.28 9.91 5.27 118.82 3.92 17.70 732
Cedar Heights pm10 20.53 15.29 6.73 135.55 3.69 16.47 732
Cedar Heights pm25 14.99 10.37 5.63 120.62 3.89 17.56 732
Cheverly co 547.90 488.21 79.70 1824.84 3.25 13.89 692
Cheverly no 2.04 1.86 0.26 4.35 1.29 1.26 692
Cheverly no2 13.64 10.56 8.19 61.04 1.03 0.90 692
Cheverly o3 38.92 38.15 15.94 77.58 0.25 -0.65 692
Cheverly pm1 17.44 12.73 6.14 129.13 3.72 15.72 693
Cheverly pm10 29.07 23.95 10.57 137.28 2.82 9.93 693
Cheverly pm25 18.33 13.23 6.61 130.99 3.68 15.58 693
HCNR co 912.75 855.14 112.09 2130.06 2.57 8.88 733
HCNR no 2.44 2.08 0.52 34.79 11.15 185.47 733
HCNR no2 12.44 9.80 5.70 42.01 1.43 1.23 733
HCNR o3 20.98 17.53 17.44 55.92 0.46 -1.03 733
HCNR pm1 12.40 8.98 4.22 114.93 4.22 19.27 733
HCNR pm10 21.74 17.72 6.13 123.39 3.56 14.87 733
HCNR pm25 13.44 9.81 4.61 117.01 4.19 19.17 733
HU - Beltsville co 801.72 744.59 78.79 1920.36 2.86 10.11 733
HU - Beltsville no 2.12 1.95 0.42 7.2 2.05 12.89 733
HU - Beltsville no2 12.74 10.27 5.96 41.24 1.29 0.78 733
HU - Beltsville o3 22.36 17.85 20.81 69.3 0.53 -0.80 733
HU - Beltsville pm1 11.52 8.52 4.94 89.34 3.77 15.37 731
HU - Beltsville pm10 59.22 18.18 7.38 3035.34 8.24 80.12 731
HU - Beltsville pm25 12.68 9.40 4.82 91.24 3.77 15.49 731
Turner Station North co 573.63 508.77 82.89 1848.75 3.03 11.50 733
Turner Station North no 2.09 1.91 0.43 7.56 2.21 13.01 733
Turner Station North no2 13.58 10.55 7.72 46.44 0.88 -0.23 733
Turner Station North o3 42.00 41.42 13.70 80.54 0.40 -0.26 733
Turner Station North pm1 21.02 14.48 8.34 203.63 4.20 19.50 733
Turner Station North pm10 32.19 23.50 9.91 215.54 3.68 15.59 733
Turner Station North pm25 22.34 15.43 8.65 206.59 4.17 19.33 733
Turner Station South co 702.43 629.64 83.32 2434.65 3.38 14.57 732
Turner Station South no 2.16 1.85 0.46 10.98 3.18 20.69 732
Turner Station South no2 13.59 10.27 7.79 45.46 0.90 -0.30 732
Turner Station South o3 32.28 29.79 14.63 71.3 0.58 -0.39 732
Turner Station South pm1 12.85 8.91 5.06 112.61 3.70 14.99 733
Turner Station South pm10 31.53 24.26 11.92 193.66 2.35 6.90 733
Turner Station South pm25 13.92 9.63 5.30 116.16 3.68 14.95 733