ID: 2256

AQSQID: 250250044

Site Name: Boston-Von Hillern

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

Updated: April 21, 2021, 8:44 p.m.

Location: Boston (S Boston), MA

Reporting: True, Located: True

Current AQI: 42.0

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
April 21, 2021, 6 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
April 21, 2021, 5 p.m. 14.0 ppb (14) 4.0 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 21, 2021, 4 p.m. 13.0 ppb (13) 5.0 ppb (5) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 21, 2021, 3 p.m. 18.0 ppb (17) 7.0 ppb (7) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 21, 2021, 2 p.m. 16.0 ppb (16) 6.0 ppb (6) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 21, 2021, 1 p.m. 22.0 ppb (21) 9.0 ppb (9) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 21, 2021, noon 20.0 ppb (19) 7.0 ppb (7) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 21, 2021, 11 a.m. 27.0 ppb (26) 10.0 ppb (10) N/A 18.0 ppb (17) N/A N/A N/A 0.05 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
April 21, 2021, 10 a.m. 37.0 ppb (35) 11.0 ppb (11) N/A 26.0 ppb (25) N/A N/A N/A 0.11 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
April 21, 2021, 9 a.m. 42.0 ppb (40) 11.0 ppb (11) N/A 30.0 ppb (29) N/A N/A N/A 0.16 ppb (3) N/A 14.0 μg/m3 (55) 55.0
 
April 21, 2021, 8 a.m. 32.0 ppb (31) 6.0 ppb (6) N/A 27.0 ppb (26) N/A N/A N/A 0.1 ppb (2) N/A 12.0 μg/m3 (50) 50.0
 
April 21, 2021, 7 a.m. 21.0 ppb (20) 3.0 ppb (3) N/A 18.0 ppb (17) N/A N/A N/A 0.04 ppb (0) N/A 9.0 μg/m3 (38) 38.0
 
April 21, 2021, 6 a.m. 19.0 ppb (18) 3.0 ppb (3) N/A 16.0 ppb (16) N/A N/A N/A 0.02 ppb (0) N/A 12.0 μg/m3 (50) 50.0
 
April 21, 2021, 5 a.m. 16.0 ppb (16) 1.0 ppb (1) N/A 15.0 ppb (15) N/A N/A N/A 0.02 ppb (0) N/A 11.0 μg/m3 (46) 46.0
 
April 21, 2021, 4 a.m. 20.0 ppb (19) 1.0 ppb (1) N/A 18.0 ppb (17) N/A N/A N/A 0.13 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
April 21, 2021, 3 a.m. 17.0 ppb (17) 2.0 ppb (2) N/A 16.0 ppb (16) N/A N/A N/A 0.2 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
April 21, 2021, 2 a.m. 16.0 ppb (16) 2.0 ppb (2) N/A 14.0 ppb (14) N/A N/A N/A 0.14 ppb (2) N/A 13.0 μg/m3 (53) 53.0
 
April 21, 2021, 1 a.m. 15.0 ppb (15) 1.0 ppb (1) N/A 14.0 ppb (14) N/A N/A N/A 0.15 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
April 21, 2021, midnight 16.0 ppb (16) 1.0 ppb (1) N/A 15.0 ppb (15) N/A N/A N/A 0.14 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
April 20, 2021, 11 p.m. 17.0 ppb (17) 2.0 ppb (2) N/A 15.0 ppb (15) N/A N/A N/A 0.17 ppb (3) N/A 15.0 μg/m3 (58) 58.0
 
April 20, 2021, 10 p.m. 14.0 ppb (14) 2.0 ppb (2) N/A 12.0 ppb (12) N/A N/A N/A 0.07 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
April 20, 2021, 9 p.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A N/A N/A 0.01 ppb (0) N/A 8.0 μg/m3 (34) 34.0
 
April 20, 2021, 8 p.m. 14.0 ppb (14) 3.0 ppb (3) N/A 11.0 ppb (11) N/A N/A N/A 0.03 ppb (0) N/A 10.0 μg/m3 (42) 42.0
 
April 20, 2021, 7 p.m. 15.0 ppb (15) 5.0 ppb (5) N/A 11.0 ppb (11) N/A N/A N/A 0.03 ppb (0) N/A 12.0 μg/m3 (50) 50.0
 
April 20, 2021, 6 p.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (12) N/A N/A N/A 0.03 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
April 20, 2021, 5 p.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (12) N/A N/A N/A 0.03 ppb (0) N/A 10.0 μg/m3 (42) 42.0
 
April 20, 2021, 4 p.m. 22.0 ppb (21) 8.0 ppb (8) N/A 14.0 ppb (14) N/A N/A N/A 0.02 ppb (0) N/A 8.0 μg/m3 (34) 34.0
 
April 20, 2021, 3 p.m. 23.0 ppb (22) 10.0 ppb (10) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 20, 2021, 2 p.m. 27.0 ppb (26) 11.0 ppb (11) N/A 16.0 ppb (16) N/A N/A N/A 0.02 ppb (0) N/A 7.0 μg/m3 (30) 30.0
 
April 20, 2021, 1 p.m. 39.0 ppb (37) 18.0 ppb (17) N/A 21.0 ppb (20) N/A N/A N/A 0.08 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
April 20, 2021, noon 51.0 ppb (49) 25.0 ppb (24) N/A 26.0 ppb (25) N/A N/A N/A 0.18 ppb (3) N/A 8.0 μg/m3 (34) 49.0
 
April 20, 2021, 11 a.m. 65.0 ppb (63) 33.0 ppb (32) N/A 31.0 ppb (30) N/A N/A N/A 0.3 ppb (4) N/A 8.0 μg/m3 (34) 63.0
 
April 20, 2021, 10 a.m. 81.0 ppb (80) 45.0 ppb (43) N/A 36.0 ppb (34) N/A N/A N/A N/A N/A 10.0 μg/m3 (42) 80.0
 
April 20, 2021, 9 a.m. 47.0 ppb (45) 18.0 ppb (17) N/A 29.0 ppb (28) N/A N/A N/A 0.24 ppb (3) N/A 10.0 μg/m3 (42) 45.0
 
April 20, 2021, 8 a.m. 35.0 ppb (34) 10.0 ppb (10) N/A 25.0 ppb (24) N/A N/A N/A 0.15 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
April 20, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A 0.09 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 20, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A N/A 0.07 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
April 20, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A N/A 0.06 ppb (2) N/A 8.0 μg/m3 (34) 34.0
 
April 20, 2021, 4 a.m. 35.0 ppb (34) 8.0 ppb (8) N/A 27.0 ppb (26) N/A N/A N/A 0.24 ppb (3) N/A 13.0 μg/m3 (53) 53.0
 
April 20, 2021, 3 a.m. 23.0 ppb (22) 2.0 ppb (2) N/A 21.0 ppb (20) N/A N/A N/A 0.18 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
April 20, 2021, 2 a.m. 27.0 ppb (26) 3.0 ppb (3) N/A 24.0 ppb (23) N/A N/A N/A 0.2 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
April 20, 2021, 1 a.m. 61.0 ppb (59) 21.0 ppb (20) N/A 39.0 ppb (37) N/A N/A N/A 0.43 ppb (5) N/A 15.0 μg/m3 (58) 59.0
 
April 20, 2021, midnight 48.0 ppb (46) 13.0 ppb (13) N/A 35.0 ppb (34) N/A N/A N/A 0.37 ppb (5) N/A 16.0 μg/m3 (60) 60.0
 
April 19, 2021, 11 p.m. 18.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (15) N/A N/A N/A 0.1 ppb (2) N/A 11.0 μg/m3 (46) 46.0
 
April 19, 2021, 10 p.m. 8.0 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 19, 2021, 9 p.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 8.0 μg/m3 (34) 34.0
 
April 19, 2021, 8 p.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 6.0 μg/m3 (25) 25.0
 
April 19, 2021, 7 p.m. 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 19, 2021, 6 p.m. 6.0 ppb (6) 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
 
April 19, 2021, 5 p.m. 8.0 ppb (8) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 19, 2021, 4 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 19, 2021, 3 p.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 6.0 μg/m3 (25) 25.0
 
April 19, 2021, 2 p.m. 21.0 ppb (20) 9.0 ppb (9) N/A 12.0 ppb (12) N/A N/A N/A 0.0 ppb (0) N/A 9.0 μg/m3 (38) 38.0
 
April 19, 2021, 1 p.m. 26.0 ppb (25) 12.0 ppb (12) N/A 14.0 ppb (14) N/A N/A N/A 0.06 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
April 19, 2021, noon 26.0 ppb (25) 11.0 ppb (11) N/A 15.0 ppb (15) N/A N/A N/A 0.08 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
April 19, 2021, 11 a.m. 67.0 ppb (65) 40.0 ppb (38) N/A 27.0 ppb (26) N/A N/A N/A 0.35 ppb (4) N/A 11.0 μg/m3 (46) 65.0
 
April 19, 2021, 10 a.m. 59.0 ppb (57) 32.0 ppb (31) N/A 27.0 ppb (26) N/A N/A N/A 0.37 ppb (5) N/A 8.0 μg/m3 (34) 57.0
 
April 19, 2021, 9 a.m. 49.0 ppb (47) 21.0 ppb (20) N/A 28.0 ppb (27) N/A N/A N/A 0.25 ppb (3) N/A 8.0 μg/m3 (34) 47.0
 
April 19, 2021, 8 a.m. 44.0 ppb (42) 17.0 ppb (17) N/A 27.0 ppb (26) N/A N/A N/A 0.12 ppb (2) N/A 9.0 μg/m3 (38) 42.0
 
April 19, 2021, 7 a.m. 43.0 ppb (41) 14.0 ppb (14) N/A 29.0 ppb (28) N/A N/A N/A 0.15 ppb (2) N/A 10.0 μg/m3 (42) 42.0
 
April 19, 2021, 6 a.m. 41.0 ppb (39) 12.0 ppb (12) N/A 29.0 ppb (28) N/A N/A N/A 0.17 ppb (3) N/A 8.0 μg/m3 (34) 39.0
 
April 19, 2021, 5 a.m. 48.0 ppb (46) 16.0 ppb (16) N/A 32.0 ppb (31) N/A N/A N/A 0.38 ppb (5) N/A 10.0 μg/m3 (42) 46.0
 
April 19, 2021, 4 a.m. 26.0 ppb (25) 5.0 ppb (5) N/A 21.0 ppb (20) N/A N/A N/A 0.1 ppb (2) N/A 9.0 μg/m3 (38) 38.0
 
April 19, 2021, 3 a.m. 17.0 ppb (17) 3.0 ppb (3) N/A 14.0 ppb (14) N/A N/A N/A 0.0 ppb (0) N/A 8.0 μg/m3 (34) 34.0
 
April 19, 2021, 2 a.m. 54.0 ppb (51) 19.0 ppb (18) N/A 36.0 ppb (34) N/A N/A N/A 0.49 ppb (6) N/A 12.0 μg/m3 (50) 51.0
 
April 19, 2021, 1 a.m. 20.0 ppb (19) 3.0 ppb (3) N/A 17.0 ppb (17) N/A N/A N/A 0.23 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
April 19, 2021, midnight 10.0 ppb (10) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 18, 2021, 11 p.m. 14.0 ppb (14) 3.0 ppb (3) N/A 12.0 ppb (12) N/A N/A N/A 0.04 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
April 18, 2021, 10 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A N/A N/A 0.02 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
April 18, 2021, 9 p.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A 0.02 ppb (0) N/A 7.0 μg/m3 (30) 30.0
 
April 18, 2021, 8 p.m. 10.0 ppb (10) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 18, 2021, 7 p.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 18, 2021, 6 p.m. 10.0 ppb (10) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A N/A 0.01 ppb (0) N/A 7.0 μg/m3 (30) 30.0
 
April 18, 2021, 5 p.m. 9.0 ppb (9) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A N/A 0.0 ppb (0) N/A 3.0 μg/m3 (13) 13.0
 
April 18, 2021, 4 p.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A 0.05 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 18, 2021, 3 p.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 18, 2021, 2 p.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 18, 2021, 1 p.m. 11.0 ppb (11) 4.0 ppb (4) N/A 7.0 ppb (7) N/A N/A N/A 0.02 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
April 18, 2021, noon 12.0 ppb (12) 4.0 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A 0.02 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
April 18, 2021, 11 a.m. 13.0 ppb (13) 4.0 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A 0.06 ppb (2) N/A 5.0 μg/m3 (21) 21.0
 
April 18, 2021, 10 a.m. 14.0 ppb (14) 3.0 ppb (3) N/A 10.0 ppb (10) N/A N/A N/A 0.08 ppb (2) N/A 4.0 μg/m3 (17) 17.0
 
April 18, 2021, 9 a.m. 11.0 ppb (11) 2.0 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 18, 2021, 8 a.m. 12.0 ppb (12) 1.0 ppb (1) N/A 11.0 ppb (11) N/A N/A N/A 0.03 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
April 18, 2021, 7 a.m. 12.0 ppb (12) 2.0 ppb (2) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 18, 2021, 6 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A N/A N/A 0.05 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 18, 2021, 5 a.m. 13.0 ppb (13) 2.0 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A 0.12 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 18, 2021, 4 a.m. 17.0 ppb (17) 4.0 ppb (4) N/A 13.0 ppb (13) N/A N/A N/A 0.11 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 18, 2021, 3 a.m. 28.0 ppb (27) 9.0 ppb (9) N/A 19.0 ppb (18) N/A N/A N/A 0.44 ppb (5) N/A 7.0 μg/m3 (30) 30.0
 
April 18, 2021, 2 a.m. 31.0 ppb (30) 9.0 ppb (9) N/A 21.0 ppb (20) N/A N/A N/A 0.43 ppb (5) N/A 5.0 μg/m3 (21) 30.0
 
April 18, 2021, 1 a.m. 32.0 ppb (31) 10.0 ppb (10) N/A 22.0 ppb (21) N/A N/A N/A 0.22 ppb (3) N/A 5.0 μg/m3 (21) 31.0
 
April 18, 2021, midnight 18.0 ppb (17) 5.0 ppb (5) N/A 14.0 ppb (14) N/A N/A N/A 0.02 ppb (0) N/A 4.0 μg/m3 (17) 17.0
 
April 17, 2021, 11 p.m. 17.0 ppb (17) 4.0 ppb (4) N/A 13.0 ppb (13) N/A N/A N/A 0.09 ppb (2) N/A 7.0 μg/m3 (30) 30.0
 
April 17, 2021, 10 p.m. 18.0 ppb (17) 5.0 ppb (5) N/A 12.0 ppb (12) N/A N/A N/A 0.12 ppb (2) N/A 6.0 μg/m3 (25) 25.0
 
April 17, 2021, 9 p.m. 10.0 ppb (10) 3.0 ppb (3) N/A 7.0 ppb (7) N/A N/A N/A 0.03 ppb (0) N/A 5.0 μg/m3 (21) 21.0
 
April 17, 2021, 8 p.m. 13.0 ppb (13) 4.0 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 17, 2021, 7 p.m. 12.0 ppb (12) 4.0 ppb (4) N/A 8.0 ppb (8) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 17, 2021, 6 p.m. 14.0 ppb (14) 5.0 ppb (5) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 14.0
 
April 17, 2021, 5 p.m. 17.0 ppb (17) 7.0 ppb (7) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 17.0
 
April 17, 2021, 4 p.m. 20.0 ppb (19) 8.0 ppb (8) N/A 12.0 ppb (12) N/A N/A N/A 0.03 ppb (0) N/A 3.0 μg/m3 (13) 19.0
 
April 17, 2021, 3 p.m. 21.0 ppb (20) 7.0 ppb (7) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 20.0
 
April 17, 2021, 2 p.m. 20.0 ppb (19) 7.0 ppb (7) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 19.0
 
April 17, 2021, 1 p.m. 21.0 ppb (20) 7.0 ppb (7) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 17, 2021, noon 21.0 ppb (20) 7.0 ppb (7) N/A 14.0 ppb (14) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 20.0
 
April 17, 2021, 11 a.m. 22.0 ppb (21) 6.0 ppb (6) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 21.0
 
April 17, 2021, 10 a.m. 22.0 ppb (21) 5.0 ppb (5) N/A 17.0 ppb (17) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 21.0
 
April 17, 2021, 9 a.m. 26.0 ppb (25) 5.0 ppb (5) N/A 20.0 ppb (19) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 25.0
 
April 17, 2021, 8 a.m. 18.0 ppb (17) 2.0 ppb (2) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 1.0 μg/m3 (5) 17.0
 
April 17, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
April 17, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 17, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 17, 2021, 4 a.m. 17.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (15) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 17.0
 
April 17, 2021, 3 a.m. 21.0 ppb (20) 5.0 ppb (5) N/A 16.0 ppb (16) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 20.0
 
April 17, 2021, 2 a.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 4.0 μg/m3 (17) 17.0
 
April 17, 2021, 1 a.m. 11.0 ppb (11) 1.0 ppb (1) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 17, 2021, midnight 15.0 ppb (15) 3.0 ppb (3) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 16, 2021, 11 p.m. 8.0 ppb (8) 0.0 ppb (0) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
April 16, 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 4.0 μg/m3 (17) 17.0
 
April 16, 2021, 9 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 7.0 μg/m3 (30) 30.0
 
April 16, 2021, 8 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 4.0 μg/m3 (17) 17.0
 
April 16, 2021, 7 p.m. 17.0 ppb (17) 5.0 ppb (5) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 16, 2021, 6 p.m. 26.0 ppb (25) 10.0 ppb (10) N/A 16.0 ppb (16) N/A N/A N/A 0.02 ppb (0) N/A 5.0 μg/m3 (21) 25.0
 
April 16, 2021, 5 p.m. 35.0 ppb (34) 15.0 ppb (15) N/A 20.0 ppb (19) N/A N/A N/A 0.03 ppb (0) N/A 3.0 μg/m3 (13) 34.0
 
April 16, 2021, 4 p.m. 35.0 ppb (34) 13.0 ppb (13) N/A 21.0 ppb (20) N/A N/A N/A 0.0 ppb (0) N/A 4.0 μg/m3 (17) 34.0
 
April 16, 2021, 3 p.m. 52.0 ppb (50) 22.0 ppb (21) N/A 30.0 ppb (29) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 50.0
 
April 16, 2021, 2 p.m. 69.0 ppb (67) 32.0 ppb (31) N/A 37.0 ppb (35) N/A N/A N/A 0.05 ppb (2) N/A 7.0 μg/m3 (30) 67.0
 
April 16, 2021, 1 p.m. 54.0 ppb (51) 24.0 ppb (23) N/A 30.0 ppb (29) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 51.0
 
April 16, 2021, noon 13.0 ppb (13) 3.0 ppb (3) N/A 10.0 ppb (10) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 16, 2021, 11 a.m. 7.0 ppb (7) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 16, 2021, 10 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 5.0 μg/m3 (21) 21.0
 
April 16, 2021, 9 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 4.0 μg/m3 (17) 17.0
 
April 16, 2021, 8 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 4.0 μg/m3 (17) 17.0
 
April 16, 2021, 7 a.m. 2.0 ppb (2) -1.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 16, 2021, 6 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 16, 2021, 5 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 16, 2021, 4 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 8.0 μg/m3 (34) 34.0
 
April 16, 2021, 3 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 8.0 μg/m3 (34) 34.0
 
April 16, 2021, 2 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 5.0 μg/m3 (21) 21.0
 
April 16, 2021, 1 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 6.0 μg/m3 (25) 25.0
 
April 16, 2021, midnight 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 15, 2021, 11 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A N/A -0.13 ppb (0) N/A 6.0 μg/m3 (25) 25.0
 
April 15, 2021, 10 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 15, 2021, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 15, 2021, 8 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 15, 2021, 7 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 15, 2021, 6 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 15, 2021, 5 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 15, 2021, 4 p.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 15, 2021, 3 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 5.0 μg/m3 (21) 21.0
 
April 15, 2021, 2 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 15, 2021, 1 p.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 15, 2021, noon 8.0 ppb (8) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
April 15, 2021, 11 a.m. 12.0 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 15, 2021, 10 a.m. 28.0 ppb (27) 10.0 ppb (10) N/A 18.0 ppb (17) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 27.0
 
April 15, 2021, 9 a.m. 20.0 ppb (19) 7.0 ppb (7) N/A 14.0 ppb (14) N/A N/A N/A 0.01 ppb (0) N/A 7.0 μg/m3 (30) 30.0
 
April 15, 2021, 8 a.m. 16.0 ppb (16) 4.0 ppb (4) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 15, 2021, 7 a.m. 15.0 ppb (15) 4.0 ppb (4) N/A 12.0 ppb (12) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 15, 2021, 6 a.m. 12.0 ppb (12) 2.0 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 15, 2021, 5 a.m. 11.0 ppb (11) 2.0 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 15, 2021, 4 a.m. 8.0 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
April 15, 2021, 3 a.m. 10.0 ppb (10) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A N/A 0.04 ppb (0) N/A 7.0 μg/m3 (30) 30.0
 
April 15, 2021, 2 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 9.0 ppb (9) N/A N/A N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
April 15, 2021, 1 a.m. 8.0 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (7) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 15, 2021, midnight 4.0 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 14, 2021, 11 p.m. 7.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
April 14, 2021, 10 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
April 14, 2021, 9 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 14, 2021, 8 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
April 14, 2021, 7 p.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0