ID: 483

AQSQID: 250250002

Site Name: Boston-Kenmore

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

Updated: March 7, 2021, 5:32 a.m.

Location: Boston (Kenmore), MA

Reporting: True, Located: True

Current AQI: 21.0

Boston (Kenmore) MA, US: 42.3489, -71.097702

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 7, 2021, 3 a.m. 11.0 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 7, 2021, 2 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 7, 2021, 1 a.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 7, 2021, midnight 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 11 p.m. 10.0 ppb (10) 1.0 ppb (1) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 10 p.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 6, 2021, 9 p.m. 7.0 ppb (7) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 8 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 7 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 6 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 5 p.m. 7.0 ppb (7) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 4 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 6, 2021, 3 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 6, 2021, 2 p.m. 7.0 ppb (7) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 6, 2021, 1 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 6, 2021, noon 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 11 a.m. 16.0 ppb (16) 2.0 ppb (2) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 10 a.m. 12.0 ppb (12) 1.0 ppb (1) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 9 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 6, 2021, 8 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 7 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 6, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 6, 2021, 4 a.m. N/A 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 6, 2021, 3 a.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 3.0 μg/m3 (13) 13.0
 
March 6, 2021, 2 a.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 3.0 μg/m3 (13) 13.0
 
March 6, 2021, 1 a.m. 12.0 ppb (12) 3.0 ppb (3) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 6, 2021, midnight 12.0 ppb (12) 2.0 ppb (2) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 5, 2021, 11 p.m. 22.0 ppb (21) 8.0 ppb (8) N/A 15.0 ppb (15) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 21.0
 
March 5, 2021, 10 p.m. 18.0 ppb (17) 6.0 ppb (6) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 17.0
 
March 5, 2021, 9 p.m. 16.0 ppb (16) 6.0 ppb (6) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 16.0
 
March 5, 2021, 8 p.m. 13.0 ppb (13) 5.0 ppb (5) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 5, 2021, 7 p.m. 14.0 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 14.0
 
March 5, 2021, 6 p.m. 12.0 ppb (12) 5.0 ppb (5) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 5, 2021, 5 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 5, 2021, 4 p.m. 13.0 ppb (13) 6.0 ppb (6) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 5, 2021, 3 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 5, 2021, 2 p.m. 13.0 ppb (13) 5.0 ppb (5) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 5, 2021, 1 p.m. 19.0 ppb (18) 8.0 ppb (8) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 18.0
 
March 5, 2021, noon 13.0 ppb (13) 5.0 ppb (5) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 5, 2021, 11 a.m. 9.0 ppb (9) 3.0 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 5, 2021, 10 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 5, 2021, 9 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 5, 2021, 8 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 5, 2021, 7 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 5, 2021, 6 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 5, 2021, 5 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 5, 2021, 4 a.m. N/A 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 5, 2021, 3 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 5, 2021, 2 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 5, 2021, 1 a.m. 6.0 ppb (6) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 5, 2021, midnight 6.0 ppb (6) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 4, 2021, 11 p.m. 15.0 ppb (15) 6.0 ppb (6) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 4, 2021, 10 p.m. 13.0 ppb (13) 5.0 ppb (5) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 4, 2021, 9 p.m. 12.0 ppb (12) 5.0 ppb (5) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 4, 2021, 8 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 4, 2021, 7 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 4, 2021, 6 p.m. 13.0 ppb (13) 6.0 ppb (6) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 4, 2021, 5 p.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 4, 2021, 4 p.m. 10.0 ppb (10) 4.0 ppb (4) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 4, 2021, 3 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 4, 2021, 2 p.m. 19.0 ppb (18) 9.0 ppb (9) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
March 4, 2021, 1 p.m. 23.0 ppb (22) 9.0 ppb (9) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
March 4, 2021, noon 34.0 ppb (33) 15.0 ppb (15) N/A 20.0 ppb (19) N/A 0.0 ppb (0) N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
March 4, 2021, 11 a.m. 22.0 ppb (21) 4.0 ppb (4) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
March 4, 2021, 10 a.m. 20.0 ppb (19) 4.0 ppb (4) N/A 16.0 ppb (16) N/A 0.0 ppb (0) N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
March 4, 2021, 9 a.m. 12.0 ppb (12) 1.0 ppb (1) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
March 4, 2021, 8 a.m. 11.0 ppb (11) 1.0 ppb (1) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
March 4, 2021, 7 a.m. 19.0 ppb (18) 3.0 ppb (3) N/A 16.0 ppb (16) N/A 0.0 ppb (0) N/A N/A N/A N/A 18.0
 
March 4, 2021, 6 a.m. 14.0 ppb (14) 2.0 ppb (2) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A N/A N/A N/A 14.0
 
March 4, 2021, 5 a.m. 13.0 ppb (13) 4.0 ppb (4) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A N/A N/A N/A 13.0
 
March 4, 2021, 4 a.m. N/A 2.0 ppb (2) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
March 4, 2021, 3 a.m. 20.0 ppb (19) 3.0 ppb (3) N/A 16.0 ppb (16) N/A 0.0 ppb (0) N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
March 4, 2021, 2 a.m. 16.0 ppb (16) 3.0 ppb (3) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A N/A N/A 12.0 μg/m3 (50) 50.0
 
March 4, 2021, 1 a.m. 14.0 ppb (14) 2.0 ppb (2) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
March 4, 2021, midnight 13.0 ppb (13) 2.0 ppb (2) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
March 3, 2021, 11 p.m. 24.0 ppb (23) 6.0 ppb (6) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
March 3, 2021, 10 p.m. 25.0 ppb (24) 8.0 ppb (8) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
March 3, 2021, 9 p.m. 22.0 ppb (21) 6.0 ppb (6) N/A 16.0 ppb (16) N/A 0.0 ppb (0) N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
March 3, 2021, 8 p.m. 18.0 ppb (17) 7.0 ppb (7) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
March 3, 2021, 7 p.m. 19.0 ppb (18) 7.0 ppb (7) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
March 3, 2021, 6 p.m. 13.0 ppb (13) 5.0 ppb (5) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
March 3, 2021, 5 p.m. 17.0 ppb (17) 8.0 ppb (8) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 3, 2021, 4 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 6.0 μg/m3 (25) 25.0
 
March 3, 2021, 3 p.m. 18.0 ppb (17) 7.0 ppb (7) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 3, 2021, 2 p.m. 29.0 ppb (28) 11.0 ppb (11) N/A 17.0 ppb (17) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 28.0
 
March 3, 2021, 1 p.m. 30.0 ppb (29) 11.0 ppb (11) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 29.0
 
March 3, 2021, noon 31.0 ppb (30) 11.0 ppb (11) N/A 20.0 ppb (19) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 30.0
 
March 3, 2021, 11 a.m. 19.0 ppb (18) 5.0 ppb (5) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 3, 2021, 10 a.m. 14.0 ppb (14) 3.0 ppb (3) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 3, 2021, 9 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 3, 2021, 8 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 3, 2021, 7 a.m. 12.0 ppb (12) 1.0 ppb (1) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 3, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 3, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 3, 2021, 4 a.m. N/A 2.0 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 3, 2021, 3 a.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 3.0 μg/m3 (13) 15.0
 
March 3, 2021, 2 a.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 3.0 μg/m3 (13) 13.0
 
March 3, 2021, 1 a.m. 8.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 3, 2021, midnight 11.0 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 2, 2021, 11 p.m. 16.0 ppb (16) 4.0 ppb (4) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 16.0
 
March 2, 2021, 10 p.m. 14.0 ppb (14) 5.0 ppb (5) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 14.0
 
March 2, 2021, 9 p.m. 13.0 ppb (13) 6.0 ppb (6) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 8 p.m. 10.0 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 7 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 6 p.m. 8.0 ppb (8) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 5 p.m. 11.0 ppb (11) 7.0 ppb (7) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 4 p.m. 10.0 ppb (10) 5.0 ppb (5) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 3 p.m. 8.0 ppb (8) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 2, 2021, 2 p.m. 14.0 ppb (14) 7.0 ppb (7) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 2, 2021, 1 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, noon 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 11 a.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 2, 2021, 10 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 9 a.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 2, 2021, 8 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 7 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 6 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 2, 2021, 5 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 2, 2021, 4 a.m. N/A 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, 3 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 2, 2021, 2 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A N/A N/A 2.0 μg/m3 (9) 9.0
 
March 2, 2021, 1 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
March 2, 2021, midnight 7.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 1, 2021, 11 p.m. 12.0 ppb (12) 4.0 ppb (4) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
March 1, 2021, 10 p.m. 16.0 ppb (16) 6.0 ppb (6) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A N/A N/A 3.0 μg/m3 (13) 16.0
 
March 1, 2021, 9 p.m. 16.0 ppb (16) 5.0 ppb (5) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 1, 2021, 8 p.m. 21.0 ppb (20) 8.0 ppb (8) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 1, 2021, 7 p.m. 25.0 ppb (24) 9.0 ppb (9) N/A 17.0 ppb (17) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 24.0
 
March 1, 2021, 6 p.m. 38.0 ppb (36) 15.0 ppb (15) N/A 23.0 ppb (22) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 36.0
 
March 1, 2021, 5 p.m. 32.0 ppb (31) 9.0 ppb (9) N/A 23.0 ppb (22) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 31.0
 
March 1, 2021, 4 p.m. 27.0 ppb (26) 7.0 ppb (7) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 26.0
 
March 1, 2021, 3 p.m. 31.0 ppb (30) 9.0 ppb (9) N/A 22.0 ppb (21) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 30.0
 
March 1, 2021, 2 p.m. 44.0 ppb (42) 15.0 ppb (15) N/A 29.0 ppb (28) N/A 0.0 ppb (0) N/A N/A N/A 8.0 μg/m3 (34) 42.0
 
March 1, 2021, 1 p.m. 65.0 ppb (63) 27.0 ppb (26) N/A 37.0 ppb (35) N/A 0.0 ppb (0) N/A N/A N/A 11.0 μg/m3 (46) 63.0
 
March 1, 2021, noon 73.0 ppb (72) 29.0 ppb (28) N/A 44.0 ppb (42) N/A 0.0 ppb (0) N/A N/A N/A 12.0 μg/m3 (50) 72.0
 
March 1, 2021, 11 a.m. 25.0 ppb (24) 4.0 ppb (4) N/A 21.0 ppb (20) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
March 1, 2021, 10 a.m. 17.0 ppb (17) 2.0 ppb (2) N/A 15.0 ppb (15) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 1, 2021, 9 a.m. 10.0 ppb (10) 1.0 ppb (1) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 1, 2021, 8 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 1, 2021, 7 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
March 1, 2021, 6 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
March 1, 2021, 5 a.m. 13.0 ppb (13) 1.0 ppb (1) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
March 1, 2021, 4 a.m. N/A 2.0 ppb (2) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
March 1, 2021, 3 a.m. 11.0 ppb (11) 2.0 ppb (2) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
March 1, 2021, 2 a.m. 16.0 ppb (16) 3.0 ppb (3) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
March 1, 2021, 1 a.m. 16.0 ppb (16) 2.0 ppb (2) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
March 1, 2021, midnight 15.0 ppb (15) 3.0 ppb (3) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Feb. 28, 2021, 11 p.m. 16.0 ppb (16) 3.0 ppb (3) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Feb. 28, 2021, 10 p.m. 15.0 ppb (15) 2.0 ppb (2) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A N/A N/A 11.0 μg/m3 (46) 46.0
 
Feb. 28, 2021, 9 p.m. 18.0 ppb (17) 3.0 ppb (3) N/A 15.0 ppb (15) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Feb. 28, 2021, 8 p.m. 15.0 ppb (15) 3.0 ppb (3) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A N/A N/A 10.0 μg/m3 (42) 42.0
 
Feb. 28, 2021, 7 p.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Feb. 28, 2021, 6 p.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A N/A N/A 8.0 μg/m3 (34) 34.0
 
Feb. 28, 2021, 5 p.m. 7.0 ppb (7) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Feb. 28, 2021, 4 p.m. 7.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Feb. 28, 2021, 3 p.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Feb. 28, 2021, 2 p.m. 15.0 ppb (15) 3.0 ppb (3) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Feb. 28, 2021, 1 p.m. 19.0 ppb (18) 3.0 ppb (3) N/A 16.0 ppb (16) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Feb. 28, 2021, noon 18.0 ppb (17) 2.0 ppb (2) N/A 16.0 ppb (16) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Feb. 28, 2021, 11 a.m. 26.0 ppb (25) 2.0 ppb (2) N/A 24.0 ppb (23) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Feb. 28, 2021, 10 a.m. 28.0 ppb (27) 1.0 ppb (1) N/A 27.0 ppb (26) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 27.0
 
Feb. 28, 2021, 9 a.m. 20.0 ppb (19) 1.0 ppb (1) N/A 19.0 ppb (18) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Feb. 28, 2021, 8 a.m. 11.0 ppb (11) 0.0 ppb (0) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Feb. 28, 2021, 7 a.m. 8.0 ppb (8) 0.0 ppb (0) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Feb. 28, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Feb. 28, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Feb. 28, 2021, 4 a.m. N/A 2.0 ppb (2) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0