ID: 2256

AQSQID: 250250044

Site Name: Boston-Von Hillern

Added: April 21, 2020, 6:24 p.m.

Updated: Feb. 25, 2021, 2:32 a.m.

Location: Boston (S Boston), MA

Reporting: True, Located: True

Current AQI: 38.0

Boston (S Boston) MA, US: 42.325197, -71.056056

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Feb. 17, 2021, 11 p.m. 27.0 ppb (26) 5.0 ppb (5) N/A 23.0 ppb (22) N/A N/A N/A 0.06 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 17, 2021, 10 p.m. 26.0 ppb (25) 6.0 ppb (6) N/A 21.0 ppb (20) N/A N/A N/A 0.06 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 17, 2021, 9 p.m. 19.0 ppb (18) 5.0 ppb (5) N/A 14.0 ppb (14) N/A N/A N/A 0.07 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 17, 2021, 8 p.m. 21.0 ppb (20) 8.0 ppb (8) N/A 14.0 ppb (14) N/A N/A N/A 0.07 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 17, 2021, 7 p.m. 20.0 ppb (19) 8.0 ppb (8) N/A 12.0 ppb (12) N/A N/A N/A 0.06 ppb (2) N/A 3.0 μg/m3 (13) 19.0
 
Feb. 17, 2021, 6 p.m. 25.0 ppb (24) 11.0 ppb (11) N/A 14.0 ppb (14) N/A N/A N/A 0.05 ppb (2) N/A 3.0 μg/m3 (13) 24.0
 
Feb. 17, 2021, 5 p.m. 23.0 ppb (22) 10.0 ppb (10) N/A 13.0 ppb (13) N/A N/A N/A 0.07 ppb (2) N/A 5.0 μg/m3 (21) 22.0
 
Feb. 17, 2021, 4 p.m. 27.0 ppb (26) 13.0 ppb (13) N/A 14.0 ppb (14) N/A N/A N/A 0.04 ppb (0) N/A 5.0 μg/m3 (21) 26.0
 
Feb. 17, 2021, 3 p.m. 21.0 ppb (20) 10.0 ppb (10) N/A 11.0 ppb (11) N/A N/A N/A 0.0 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 17, 2021, 2 p.m. 29.0 ppb (28) 15.0 ppb (15) N/A 14.0 ppb (14) N/A N/A N/A 0.03 ppb (0) N/A 6.0 μg/m3 (25) 28.0
 
Feb. 17, 2021, 1 p.m. 35.0 ppb (34) 18.0 ppb (17) N/A 17.0 ppb (17) N/A N/A N/A 0.03 ppb (0) N/A 7.0 μg/m3 (30) 34.0
 
Feb. 17, 2021, noon 38.0 ppb (36) 19.0 ppb (18) N/A 19.0 ppb (18) N/A N/A N/A 0.07 ppb (2) N/A 6.0 μg/m3 (25) 36.0
 
Feb. 17, 2021, 11 a.m. 37.0 ppb (35) 17.0 ppb (17) N/A 20.0 ppb (19) N/A N/A N/A 0.07 ppb (2) N/A 5.0 μg/m3 (21) 35.0
 
Feb. 17, 2021, 10 a.m. 25.0 ppb (24) 10.0 ppb (10) N/A 16.0 ppb (16) N/A N/A N/A 0.01 ppb (0) N/A 4.0 μg/m3 (17) 24.0
 
Feb. 17, 2021, 9 a.m. 16.0 ppb (16) 5.0 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 16.0
 
Feb. 17, 2021, 8 a.m. 12.0 ppb (12) 3.0 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 12.0
 
Feb. 17, 2021, 7 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Feb. 17, 2021, 6 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Feb. 17, 2021, 5 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Feb. 17, 2021, 4 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.01 ppb (0) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 17, 2021, 3 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.0 ppb (0) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 17, 2021, 2 a.m. 12.0 ppb (12) 2.0 ppb (2) N/A 10.0 ppb (10) N/A N/A N/A 0.04 ppb (0) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 17, 2021, 1 a.m. 30.0 ppb (29) 8.0 ppb (8) N/A 22.0 ppb (21) N/A N/A N/A 0.2 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 17, 2021, midnight 37.0 ppb (35) 11.0 ppb (11) N/A 26.0 ppb (25) N/A N/A N/A 0.37 ppb (5) N/A 8.0 μg/m3 (34) 35.0
 
Feb. 16, 2021, 11 p.m. 47.0 ppb (45) 16.0 ppb (16) N/A 31.0 ppb (30) N/A N/A N/A 0.34 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 16, 2021, 10 p.m. 29.0 ppb (28) 8.0 ppb (8) N/A 21.0 ppb (20) N/A N/A N/A 0.16 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 16, 2021, 9 p.m. 19.0 ppb (18) 4.0 ppb (4) N/A 14.0 ppb (14) N/A N/A N/A 0.03 ppb (0) N/A N/A 18.0
 
Feb. 16, 2021, 8 p.m. 20.0 ppb (19) 4.0 ppb (4) N/A 16.0 ppb (16) N/A N/A N/A 0.03 ppb (0) N/A N/A 19.0
 
Feb. 16, 2021, 7 p.m. 14.0 ppb (14) 2.0 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 14.0
 
Feb. 16, 2021, 6 p.m. 32.0 ppb (31) 8.0 ppb (8) N/A 24.0 ppb (23) N/A N/A N/A 0.02 ppb (0) N/A N/A 31.0
 
Feb. 16, 2021, 5 p.m. 56.0 ppb (54) 24.0 ppb (23) N/A 32.0 ppb (31) N/A N/A N/A 0.19 ppb (3) N/A N/A 54.0
 
Feb. 16, 2021, 4 p.m. 56.0 ppb (54) 27.0 ppb (26) N/A 29.0 ppb (28) N/A N/A N/A 0.12 ppb (2) N/A N/A 54.0
 
Feb. 16, 2021, 3 p.m. 57.0 ppb (55) 26.0 ppb (25) N/A 31.0 ppb (30) N/A N/A N/A 0.11 ppb (2) N/A N/A 55.0
 
Feb. 16, 2021, 2 p.m. 49.0 ppb (47) 23.0 ppb (22) N/A 26.0 ppb (25) N/A N/A N/A 0.01 ppb (0) N/A N/A 47.0
 
Feb. 16, 2021, 1 p.m. 28.0 ppb (27) 7.0 ppb (7) N/A 21.0 ppb (20) N/A N/A N/A N/A N/A N/A 27.0
 
Feb. 16, 2021, noon 25.0 ppb (24) 5.0 ppb (5) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A N/A 24.0
 
Feb. 16, 2021, 11 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A N/A 10.0
 
Feb. 16, 2021, 10 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A N/A 5.0
 
Feb. 16, 2021, 9 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A N/A 3.0
 
Feb. 16, 2021, 8 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A N/A 3.0
 
Feb. 16, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Feb. 16, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Feb. 16, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Feb. 16, 2021, 4 a.m. 23.0 ppb (22) 2.0 ppb (2) N/A 21.0 ppb (20) N/A N/A N/A 0.03 ppb (0) N/A N/A 22.0
 
Feb. 16, 2021, 3 a.m. 20.0 ppb (19) 1.0 ppb (1) N/A 19.0 ppb (18) N/A N/A N/A 0.01 ppb (0) N/A N/A 19.0
 
Feb. 16, 2021, 2 a.m. 16.0 ppb (16) 0.0 ppb (0) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A N/A 16.0
 
Feb. 16, 2021, 1 a.m. 18.0 ppb (17) 2.0 ppb (2) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A N/A 17.0
 
Feb. 16, 2021, midnight 14.0 ppb (14) 1.0 ppb (1) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A N/A 14.0
 
Feb. 15, 2021, 11 p.m. 20.0 ppb (19) 2.0 ppb (2) N/A 18.0 ppb (17) N/A N/A N/A 0.04 ppb (0) N/A N/A 19.0
 
Feb. 15, 2021, 10 p.m. 13.0 ppb (13) 1.0 ppb (1) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 13.0
 
Feb. 15, 2021, 9 p.m. 13.0 ppb (13) 1.0 ppb (1) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 13.0
 
Feb. 15, 2021, 8 p.m. 15.0 ppb (15) 2.0 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A N/A 15.0
 
Feb. 15, 2021, 7 p.m. 15.0 ppb (15) 3.0 ppb (3) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A N/A 15.0
 
Feb. 15, 2021, 6 p.m. 19.0 ppb (18) 3.0 ppb (3) N/A 16.0 ppb (16) N/A N/A N/A 0.0 ppb (0) N/A N/A 18.0
 
Feb. 15, 2021, 5 p.m. 17.0 ppb (17) 3.0 ppb (3) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A N/A 17.0
 
Feb. 15, 2021, 4 p.m. 15.0 ppb (15) 3.0 ppb (3) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 15.0
 
Feb. 15, 2021, 3 p.m. 16.0 ppb (16) 3.0 ppb (3) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A N/A 16.0
 
Feb. 15, 2021, 2 p.m. 18.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A N/A 17.0
 
Feb. 15, 2021, 1 p.m. 26.0 ppb (25) 6.0 ppb (6) N/A 20.0 ppb (19) N/A N/A N/A 0.03 ppb (0) N/A N/A 25.0
 
Feb. 15, 2021, noon 28.0 ppb (27) 7.0 ppb (7) N/A 22.0 ppb (21) N/A N/A N/A 0.03 ppb (0) N/A N/A 27.0
 
Feb. 15, 2021, 11 a.m. 19.0 ppb (18) 2.0 ppb (2) N/A 17.0 ppb (17) N/A N/A N/A 0.01 ppb (0) N/A N/A 18.0
 
Feb. 15, 2021, 10 a.m. 16.0 ppb (16) 1.0 ppb (1) N/A 15.0 ppb (15) N/A N/A N/A 0.0 ppb (0) N/A N/A 16.0
 
Feb. 15, 2021, 9 a.m. 16.0 ppb (16) 2.0 ppb (2) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A N/A 16.0
 
Feb. 15, 2021, 8 a.m. 12.0 ppb (12) 0.0 ppb (0) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 12.0
 
Feb. 15, 2021, 7 a.m. 10.0 ppb (10) 0.0 ppb (0) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A N/A 10.0
 
Feb. 15, 2021, 6 a.m. 13.0 ppb (13) 0.0 ppb (0) N/A 13.0 ppb (13) N/A N/A N/A 0.0 ppb (0) N/A N/A 13.0
 
Feb. 15, 2021, 5 a.m. 19.0 ppb (18) 0.0 ppb (0) N/A 19.0 ppb (18) N/A N/A N/A 0.05 ppb (2) N/A N/A 18.0
 
Feb. 15, 2021, 4 a.m. 30.0 ppb (29) 1.0 ppb (1) N/A 29.0 ppb (28) N/A N/A N/A 0.1 ppb (2) N/A N/A 29.0
 
Feb. 15, 2021, 3 a.m. 27.0 ppb (26) 2.0 ppb (2) N/A 25.0 ppb (24) N/A N/A N/A 0.08 ppb (2) N/A N/A 26.0
 
Feb. 15, 2021, 2 a.m. 17.0 ppb (17) 0.0 ppb (0) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A N/A 17.0
 
Feb. 15, 2021, 1 a.m. 9.0 ppb (9) 0.0 ppb (0) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A N/A 9.0
 
Feb. 15, 2021, midnight 8.0 ppb (8) 0.0 ppb (0) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A N/A 8.0
 
Feb. 14, 2021, 11 p.m. 8.0 ppb (8) 0.0 ppb (0) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A N/A 8.0
 
Feb. 14, 2021, 10 p.m. 11.0 ppb (11) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A N/A 11.0
 
Feb. 14, 2021, 9 p.m. 13.0 ppb (13) 2.0 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A 0.01 ppb (0) N/A N/A 13.0
 
Feb. 14, 2021, 8 p.m. 13.0 ppb (13) 2.0 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A N/A 13.0
 
Feb. 14, 2021, 7 p.m. 21.0 ppb (20) 5.0 ppb (5) N/A 17.0 ppb (17) N/A N/A N/A 0.02 ppb (0) N/A N/A 20.0
 
Feb. 14, 2021, 6 p.m. 27.0 ppb (26) 7.0 ppb (7) N/A 19.0 ppb (18) N/A N/A N/A 0.05 ppb (2) N/A N/A 26.0
 
Feb. 14, 2021, 5 p.m. 29.0 ppb (28) 10.0 ppb (10) N/A 19.0 ppb (18) N/A N/A N/A 0.1 ppb (2) N/A N/A 28.0
 
Feb. 14, 2021, 4 p.m. 33.0 ppb (32) 12.0 ppb (12) N/A 21.0 ppb (20) N/A N/A N/A 0.12 ppb (2) N/A N/A 32.0
 
Feb. 14, 2021, 3 p.m. 38.0 ppb (36) 13.0 ppb (13) N/A 25.0 ppb (24) N/A N/A N/A 0.13 ppb (2) N/A N/A 36.0
 
Feb. 14, 2021, 2 p.m. 46.0 ppb (44) 17.0 ppb (17) N/A 29.0 ppb (28) N/A N/A N/A 0.09 ppb (2) N/A N/A 44.0
 
Feb. 14, 2021, 1 p.m. 41.0 ppb (39) 12.0 ppb (12) N/A 28.0 ppb (27) N/A N/A N/A 0.09 ppb (2) N/A N/A 39.0
 
Feb. 14, 2021, noon 44.0 ppb (42) 12.0 ppb (12) N/A 31.0 ppb (30) N/A N/A N/A 0.15 ppb (2) N/A N/A 42.0
 
Feb. 14, 2021, 11 a.m. 46.0 ppb (44) 12.0 ppb (12) N/A 34.0 ppb (33) N/A N/A N/A 0.13 ppb (2) N/A N/A 44.0
 
Feb. 14, 2021, 10 a.m. 44.0 ppb (42) 10.0 ppb (10) N/A 34.0 ppb (33) N/A N/A N/A 0.05 ppb (2) N/A N/A 42.0
 
Feb. 14, 2021, 9 a.m. 32.0 ppb (31) 5.0 ppb (5) N/A 27.0 ppb (26) N/A N/A N/A 0.0 ppb (0) N/A N/A 31.0
 
Feb. 14, 2021, 8 a.m. 21.0 ppb (20) 1.0 ppb (1) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A N/A 20.0
 
Feb. 14, 2021, 7 a.m. 13.0 ppb (13) 0.0 ppb (0) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A N/A 14.0
 
Feb. 14, 2021, 6 a.m. 12.0 ppb (12) 0.0 ppb (0) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 12.0
 
Feb. 14, 2021, 5 a.m. 12.0 ppb (12) 0.0 ppb (0) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 12.0
 
Feb. 14, 2021, 4 a.m. 7.0 ppb (7) 0.0 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A N/A 7.0
 
Feb. 14, 2021, 3 a.m. 12.0 ppb (12) 0.0 ppb (0) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 12.0
 
Feb. 14, 2021, 2 a.m. 7.0 ppb (7) 0.0 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A N/A 7.0
 
Feb. 14, 2021, 1 a.m. 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A N/A 5.0
 
Feb. 14, 2021, midnight 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A N/A 3.0
 
Feb. 13, 2021, 11 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A N/A 3.0
 
Feb. 13, 2021, 10 p.m. 8.0 ppb (8) 0.0 ppb (0) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A N/A 8.0
 
Feb. 13, 2021, 9 p.m. 7.0 ppb (7) 0.0 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A N/A 7.0
 
Feb. 13, 2021, 8 p.m. 6.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 6.0
 
Feb. 13, 2021, 7 p.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A N/A 7.0
 
Feb. 13, 2021, 6 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A N/A 11.0
 
Feb. 13, 2021, 5 p.m. 15.0 ppb (15) 4.0 ppb (4) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A N/A 15.0
 
Feb. 13, 2021, 4 p.m. 17.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 17.0
 
Feb. 13, 2021, 3 p.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 17.0
 
Feb. 13, 2021, 2 p.m. 38.0 ppb (36) 15.0 ppb (15) N/A 22.0 ppb (21) N/A N/A N/A 0.05 ppb (2) N/A N/A 36.0
 
Feb. 13, 2021, 1 p.m. 31.0 ppb (30) 11.0 ppb (11) N/A 19.0 ppb (18) N/A N/A N/A 0.02 ppb (0) N/A N/A 30.0
 
Feb. 13, 2021, noon 32.0 ppb (31) 11.0 ppb (11) N/A 21.0 ppb (20) N/A N/A N/A 0.09 ppb (2) N/A N/A 31.0
 
Feb. 13, 2021, 11 a.m. 32.0 ppb (31) 12.0 ppb (12) N/A 20.0 ppb (19) N/A N/A N/A 0.14 ppb (2) N/A N/A 31.0
 
Feb. 13, 2021, 10 a.m. 20.0 ppb (19) 5.0 ppb (5) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A N/A 19.0
 
Feb. 13, 2021, 9 a.m. 15.0 ppb (15) 3.0 ppb (3) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A N/A 15.0
 
Feb. 13, 2021, 8 a.m. 11.0 ppb (11) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A N/A 11.0
 
Feb. 13, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Feb. 13, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.02 ppb (0) N/A N/A 0.0
Feb. 13, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.04 ppb (0) N/A N/A 0.0
Feb. 13, 2021, 4 a.m. 17.0 ppb (17) 3.0 ppb (3) N/A 14.0 ppb (14) N/A N/A N/A 0.11 ppb (2) N/A N/A 17.0
 
Feb. 13, 2021, 3 a.m. 25.0 ppb (24) 5.0 ppb (5) N/A 20.0 ppb (19) N/A N/A N/A 0.17 ppb (3) N/A N/A 24.0
 
Feb. 13, 2021, 2 a.m. 29.0 ppb (28) 7.0 ppb (7) N/A 22.0 ppb (21) N/A N/A N/A 0.18 ppb (3) N/A N/A 28.0
 
Feb. 13, 2021, 1 a.m. 34.0 ppb (33) 9.0 ppb (9) N/A 25.0 ppb (24) N/A N/A N/A 0.28 ppb (4) N/A N/A 33.0
 
Feb. 13, 2021, midnight 23.0 ppb (22) 5.0 ppb (5) N/A 18.0 ppb (17) N/A N/A N/A 0.18 ppb (3) N/A N/A 22.0
 
Feb. 12, 2021, 11 p.m. 31.0 ppb (30) 9.0 ppb (9) N/A 22.0 ppb (21) N/A N/A N/A 0.2 ppb (3) N/A N/A 30.0
 
Feb. 12, 2021, 10 p.m. 32.0 ppb (31) 9.0 ppb (9) N/A 22.0 ppb (21) N/A N/A N/A 0.17 ppb (3) N/A N/A 31.0
 
Feb. 12, 2021, 9 p.m. 35.0 ppb (34) 12.0 ppb (12) N/A 23.0 ppb (22) N/A N/A N/A 0.18 ppb (3) N/A N/A 34.0
 
Feb. 12, 2021, 8 p.m. 28.0 ppb (27) 9.0 ppb (9) N/A 19.0 ppb (18) N/A N/A N/A 0.1 ppb (2) N/A N/A 27.0
 
Feb. 12, 2021, 7 p.m. 37.0 ppb (35) 17.0 ppb (17) N/A 21.0 ppb (20) N/A N/A N/A 0.09 ppb (2) N/A N/A 35.0
 
Feb. 12, 2021, 6 p.m. 35.0 ppb (34) 16.0 ppb (16) N/A 18.0 ppb (17) N/A N/A N/A 0.08 ppb (2) N/A N/A 34.0
 
Feb. 12, 2021, 5 p.m. 32.0 ppb (31) 15.0 ppb (15) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A N/A 31.0
 
Feb. 12, 2021, 4 p.m. 41.0 ppb (39) 21.0 ppb (20) N/A 19.0 ppb (18) N/A N/A N/A 0.04 ppb (0) N/A 4.0 μg/m3 (17) 39.0
 
Feb. 12, 2021, 3 p.m. 40.0 ppb (38) 21.0 ppb (20) N/A 19.0 ppb (18) N/A N/A N/A 0.03 ppb (0) N/A 3.0 μg/m3 (13) 38.0
 
Feb. 12, 2021, 2 p.m. 35.0 ppb (34) 18.0 ppb (17) N/A 17.0 ppb (17) N/A N/A N/A 0.02 ppb (0) N/A N/A 34.0
 
Feb. 12, 2021, 1 p.m. 44.0 ppb (42) 24.0 ppb (23) N/A 20.0 ppb (19) N/A N/A N/A 0.02 ppb (0) N/A N/A 42.0
 
Feb. 12, 2021, noon 48.0 ppb (46) 25.0 ppb (24) N/A 23.0 ppb (22) N/A N/A N/A 0.06 ppb (2) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 12, 2021, 11 a.m. 48.0 ppb (46) 23.0 ppb (22) N/A 25.0 ppb (24) N/A N/A N/A 0.08 ppb (2) N/A 10.0 μg/m3 (42) 46.0
 
Feb. 12, 2021, 10 a.m. 28.0 ppb (27) 10.0 ppb (10) N/A 18.0 ppb (17) N/A N/A N/A 0.01 ppb (0) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 12, 2021, 9 a.m. 19.0 ppb (18) 5.0 ppb (5) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Feb. 12, 2021, 8 a.m. 17.0 ppb (17) 3.0 ppb (3) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Feb. 12, 2021, 7 a.m. 14.0 ppb (14) 2.0 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Feb. 12, 2021, 6 a.m. 16.0 ppb (16) 2.0 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
Feb. 12, 2021, 5 a.m. 13.0 ppb (13) 2.0 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Feb. 12, 2021, 3 a.m. 17.0 ppb (17) 3.0 ppb (3) N/A 14.0 ppb (14) N/A N/A N/A 0.09 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 12, 2021, 2 a.m. 18.0 ppb (17) 4.0 ppb (4) N/A 14.0 ppb (14) N/A N/A N/A 0.08 ppb (2) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 12, 2021, 1 a.m. 18.0 ppb (17) 4.0 ppb (4) N/A 14.0 ppb (14) N/A N/A N/A 0.08 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 12, 2021, midnight 18.0 ppb (17) 4.0 ppb (4) N/A 14.0 ppb (14) N/A N/A N/A 0.09 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 11, 2021, 11 p.m. 22.0 ppb (21) 5.0 ppb (5) N/A 17.0 ppb (17) N/A N/A N/A 0.13 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 11, 2021, 10 p.m. 22.0 ppb (21) 6.0 ppb (6) N/A 16.0 ppb (16) N/A N/A N/A 0.06 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 11, 2021, 9 p.m. 21.0 ppb (20) 6.0 ppb (6) N/A 16.0 ppb (16) N/A N/A N/A 0.06 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 11, 2021, 8 p.m. 22.0 ppb (21) 8.0 ppb (8) N/A 13.0 ppb (13) N/A N/A N/A 0.07 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 11, 2021, 7 p.m. 24.0 ppb (23) 9.0 ppb (9) N/A 15.0 ppb (15) N/A N/A N/A 0.05 ppb (2) N/A 15.0 μg/m3 (58) 58.0
 
Feb. 11, 2021, 6 p.m. 33.0 ppb (32) 14.0 ppb (14) N/A 19.0 ppb (18) N/A N/A N/A 0.1 ppb (2) N/A 17.0 μg/m3 (62) 62.0
 
Feb. 11, 2021, 5 p.m. 33.0 ppb (32) 14.0 ppb (14) N/A 18.0 ppb (17) N/A N/A N/A 0.09 ppb (2) N/A 18.0 μg/m3 (64) 64.0
 
Feb. 11, 2021, 4 p.m. 45.0 ppb (43) 23.0 ppb (22) N/A 22.0 ppb (21) N/A N/A N/A 0.07 ppb (2) N/A 19.0 μg/m3 (66) 66.0
 
Feb. 11, 2021, 3 p.m. 52.0 ppb (50) 26.0 ppb (25) N/A 25.0 ppb (24) N/A N/A N/A 0.18 ppb (3) N/A 22.0 μg/m3 (72) 72.0
 
Feb. 11, 2021, 2 p.m. 62.0 ppb (60) 33.0 ppb (32) N/A 30.0 ppb (29) N/A N/A N/A 0.22 ppb (3) N/A 27.0 μg/m3 (83) 83.0
 
Feb. 11, 2021, 1 p.m. 98.0 ppb (98) 58.0 ppb (56) N/A 40.0 ppb (38) N/A N/A N/A 0.34 ppb (4) N/A 26.0 μg/m3 (81) 98.0
 
Feb. 11, 2021, noon 96.0 ppb (96) 57.0 ppb (55) N/A 40.0 ppb (38) N/A N/A N/A 0.36 ppb (5) N/A 19.0 μg/m3 (66) 96.0
 
Feb. 11, 2021, 11 a.m. 87.0 ppb (87) 46.0 ppb (44) N/A 41.0 ppb (39) N/A N/A N/A 0.31 ppb (4) N/A 22.0 μg/m3 (72) 87.0
 
Feb. 11, 2021, 10 a.m. 61.0 ppb (59) 24.0 ppb (23) N/A 37.0 ppb (35) N/A N/A N/A 0.18 ppb (3) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 11, 2021, 9 a.m. 45.0 ppb (43) 13.0 ppb (13) N/A 32.0 ppb (31) N/A N/A N/A 0.12 ppb (2) N/A 17.0 μg/m3 (62) 62.0
 
Feb. 11, 2021, 8 a.m. 41.0 ppb (39) 9.0 ppb (9) N/A 32.0 ppb (31) N/A N/A N/A 0.01 ppb (0) N/A 15.0 μg/m3 (58) 58.0
 
Feb. 11, 2021, 7 a.m. 47.0 ppb (45) 12.0 ppb (12) N/A 35.0 ppb (34) N/A N/A N/A 0.02 ppb (0) N/A 17.0 μg/m3 (62) 62.0
 
Feb. 11, 2021, 6 a.m. 27.0 ppb (26) 2.0 ppb (2) N/A 25.0 ppb (24) N/A N/A N/A N/A N/A 13.0 μg/m3 (53) 53.0
 
Feb. 11, 2021, 5 a.m. 32.0 ppb (31) 5.0 ppb (5) N/A 27.0 ppb (26) N/A N/A N/A 0.08 ppb (2) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 11, 2021, 4 a.m. 27.0 ppb (26) 4.0 ppb (4) N/A 23.0 ppb (22) N/A N/A N/A 0.17 ppb (3) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 11, 2021, 3 a.m. 31.0 ppb (30) 6.0 ppb (6) N/A 25.0 ppb (24) N/A N/A N/A 0.2 ppb (3) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 11, 2021, 2 a.m. 45.0 ppb (43) 12.0 ppb (12) N/A 33.0 ppb (32) N/A N/A N/A 0.36 ppb (5) N/A 19.0 μg/m3 (66) 66.0
 
Feb. 11, 2021, 1 a.m. 31.0 ppb (30) 7.0 ppb (7) N/A 24.0 ppb (23) N/A N/A N/A 0.28 ppb (4) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 11, 2021, midnight 27.0 ppb (26) 7.0 ppb (7) N/A 21.0 ppb (20) N/A N/A N/A 0.19 ppb (3) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 10, 2021, 11 p.m. 27.0 ppb (26) 6.0 ppb (6) N/A 20.0 ppb (19) N/A N/A N/A 0.16 ppb (3) N/A 16.0 μg/m3 (60) 60.0